St. Kosmas Aitolos: This prayer should never be absent from you...

This prayer should never be absent from you: 

Lord Jesus Christ, Son and Logos of the living God, through the Theotokos and all the Saints, have mercy upon me, Thy sinful and unworthy servant." (This is the actual Jesus Prayer: "O LORD JESUS CHRIST, SON OF GOD, HAVE MERCY UPON ME, A SINNER.") 

Always say this prayer both with your mouth and with your mind, day and night, wherever you may be, whether eating, walking, working, or sitting. Always meditate on it, as it benefits you a great deal., frees you here from every evil, delivers you there from eternal Hell, and renders you worthy of going to Paradise, our heavenly country."

St. Kosmas Aitolos