It is very useful and simply necessary for every Christian to pray with Jesus ' prayer as often as possible (Lord Jesus Christ, Son of God, have mercy on me, The Sinner!
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This brings salvation, and the Christian should pray this prayer aloud or within himself whenever he can during the day and night, and at every work.
If a Christian wishes to progress spiritually in this prayer and to pray with it in his mind and heart, then he should in no case do so "on his own," but should be guided by the advice of an experienced spiritual master and read a lot about Jesus ' Prayer.
The most important thing is to know that this prayer requires nothing but forgiveness.