~ The Jesus Prayer
But the question arises: where is the key to the opening up of spiritual joys? To this there is one answer: in the Jesus Prayer. There is great power in this prayer. It has varying degrees. The very first is the simple utterance of the words, "Lord Jesus Christ, Son of God, have mercy on me, a sinner." At the highest degrees it attains such power that it can move mountains. Of course, not everyone can attain to this, but to utter this great prayer is not difficult for anyone, and the benefit is enormous. This is the most powerful weapon for the struggle against the passions. One person, for instance, is proud. Another is overcome by lustful thoughts... A third is envious and has no strength to fight against it? where does one get this strength? Solely in the Jesus Prayer. The enemy distracts us from it in every way: "Well, what is this nonsense of repeating the same thing when neither the mind nor the heart takes part in the prayer? Better to replace it with something else...." Don't listen to him, hes lying; continue laboring in the prayer, and it will not leave you fruitless.
All the saints held to this prayer, and it became so dear to them that they wouldn't have agreed to exchange it for anything. When their mind was distracted by something else, they suffered and strove to begin the prayer again. Their striving was similar to the desire of a thirsty man to drink. Sometimes a man does not manage to satisfy his desire due to the lack of water; then, finding a spring, he drinks insatiably. Thus did the saints thirst to begin the prayer, and they began it with ardent love.
Elder Barsanuphius of Optina
life
~ On Guard
Things here are more fearful than those there; and so we should be on our guard. I don?t say: we shouldn't eat, drink, or clothe ourselves. I don?t say that; but whether we eat, or drink, or whatever we do, let us do everything to the glory of God, [1 Cor 10,31-32.] giving no offense to Jews or Greeks or to the Church of God, as the Apostle teaches. Yes, I exhort, yes, I implore, my brothers, make my joy complete, as the Apostle again says, be of the same mind, having the same love, being in full accord and of one mind. Do nothing from selfish ambition or vainglory; but in humility think of others as better than yourselves [Phil 2,2-3.]. Let us secure our senses, sight, hearing, smell, taste, touch, through them death enters. Let us bridle our mind not to be carried off to things it should not, not to step into the pitfall of unseemly things, not to picture to ourselves evil images nor to conceive sinful desires, from which we gain no profit or pleasure; on the contrary we are pained and crushed accomplishing nothing useful. There is one repose then and one pleasure, to cleanse the soul and to look towards dispassion.
St. Theodore the Studite
Lenten Catechesis 60