1) Fr Nikolai Vedernikov
This short prayer – “Lord Jesus Christ, Son of God, have mercy on me, a sinner” – contains our entire Orthodox confession of faith; all dogma is built on it. If you say it attentively, then the Lord will gradually purify your inner world.”
2) St Theophan the Recluse
Every prayer must come from the heart, and any other prayer is no prayer at all. Prayer-book prayers, your own prayers, and very short prayers, all must issue forth from the heart to God, seen before you. And still more must this be so with the Jesus Prayer
3) St Hesychios the priest
Truly blessed is the man whose mind and heart are as closely attached to the Jesus Prayer and to the ceaseless invocation of His name as air to the body or flame to the wax. The sun rising over the earth creates the daylight; and the venerable and holy name of the Lord Jesus, shining continually in the mind, gives birth to countless intellections radiant as the sun.
3) St John of Kronstadt
Two completely opposing forces influence me: the force of good and force of evil, the force of life and the force of death. Being spiritual powers, both are invisible. Aroused by my free and sincere prayer, the good force always chases away the evil one, for the evil force derives its strength only from the evil concealed in me. To avoid the chilling influence of the evil spirit, we should always have in our heart the Jesus Prayer: “Jesus, Son of God, have mercy upon me.” Against the invisible devil stands the invisible God, against him who is powerful stand He who is the most powerful of all.
4) St John Chrysostom
Brothers, be always occupied with the intellectual prayer and do not move far away from God until you receive God’s mercy and pity. Never ask for anything but for His infinite mercy and this is enough for your salvation. When asking for His mercy, cry aloud in entreaty with humble and contrite heart form morning to night and, if possible, during the whole night, saying unceasingly: Lord Jesus Christ, Son of God, have mercy on us”.
5) The nun Tatiana
If someone dies while saying the Jesus Prayer, his soul stands in the presence of the Lord, and he will be inseparable from Him for eternity. Likewise, if a man dies while uttering the prayer, ‘Most Holy Theotokos, save me, a sinner,’ then he will be inseparable from the Mother of God. If someone is not able to utter even a single word, then, if he struggled to attain this prayer during his life on earth, his soul will say it for him on his deathbed. The state in which the soul leaves the body is the state in which it abides forever. There will be no change for the better. Only if one is commemorated (on earth) can he alter the state of his soul.
6) Metropolitan Hierotheos of Nafpatkos from the Epilogue to A Night on the Desert of the Holy Mountain.
It is necessary that we live in Christ, the Word of God and become Christ and the Word of God by grace. This is achieved when we live in the Church and participate in its holy mysteries…[and also] with the invocation of the name of Jesus and the reciting of the Jesus prayer. “Lord Jesus Christ, Son of God, have mercy on me, a sinner”, especially as the Jesus prayer is very closely associated with Holy Communion. All of the theology of our holy Orthodox Church is hidden in this small prayer. That is why we would always meditate on the sweetest and most joy-producing name of Jesus. The Jesus prayer is not only for monks. Of course, they have the opportunity to live continually within it. However, we, who are sinners, can also recite it.
Let us set aside a certain time for this purpose and begin by saying the prayer for ten minutes in the morning and ten minutes at night, as undistractedly as possible. It is very important to set aside a fixed time (even if a very short one) where there are no interruptions. With the passage of time this certain hour will become longer and will sweeten the soul, the lips… Let us say it even when we walk in the street as well as before falling asleep, whenever we have spare time. Let husband and wife or all the family say it in the morning and in the evening for a few minutes. One of them should recite it calmly and peacefully and the rest of them Listen to it. Much grace will come then to the family. There are many couples and families that have practised it and have seen miracles in their lives… Those who want to go deeper in prayer need an experienced spiritual guide.
7) St Seraphim of Viritsa
Even in the most difficult times, he who will occupy himself diligently with the Jesus prayer, ascending with the frequent invocation of the Son of God’s name in ceaseless prayer, will be able to be saved easily.
8) Elder Ephraim of Arizona (living saint)
My children, I beg you, for the love of God, do not stop saying the prayer of our Christ, not even for a moment. Your lips should continuously murmur the name of Jesus Who destroys the devil and all his plots. Cry out incessantly to our Christ, and at once He will hasten wholeheartedly to help us. Just as iron cannot be grabbed or even approached when it is red-hot, the same thing happens with the soul of him who says the prayer with the fervor of Christ. The demons do not approach it—and how could they? For if they draw near it, they will be burned by the divine fire which the divine name contains. Whoever prays is enlightened, and whoever does not pray is darkened. Prayer is the provider of divine light. This is why everyone who prays well becomes all radiant, and the Spirit of God dwells in him.
If despondency, indifference, listlessness, etc., approach us, let us pray with fear, pain, and great noetic vigilance, and we will immediately experience the miracle of consolation and joy by the grace of God. It is not possible for a person who prays to hold a grudge against someone or to refuse to forgive him for any fault whatsoever. Everything is reduced to ashes when it comes near the fire of the Jesus prayer. So, my children, struggle in the salvific and sanctifying prayer of our Christ, so that you may become radiant and holy. Pray also for me, the indolent sinner, so that God may be merciful on the multitude of my sins, as well as on my countless liabilities.
9) Bishop Justin
Every Christian must always remember that he should unite with the Lord our Saviour with all his being, letting Him come and dwell in his mind and In his heart; and the surest way to achieve such a union with the Lord, next to Communion of His Flesh and Blood, is the inner Jesus Prayer. Is the Jesus Prayer obligatory for laymen too, and not only for monks? Indeed It is obligatory, for, as we said, every Christian should be united with the Lord In his heart, and the best means to achieve such a union is precisely the Jesus Prayer.
10) St Theophan the Recluse
Zealous Christians have a certain technique that they apply to secure the continual remembrance of God more firmly. It is the constant repetition of a short prayer, ordinarily either, “Lord, have mercy,” or “Lord Jesus Christ, have mercy on me, a sinner.” If you haven’t heard this, then listen now. If you have never done this, begin now.