"Lord Jesus Christ, Son of God, have mercy on me a sinner": let all thine attention and training be in this. Walking, sitting, doing, and standing in church before the divine service, coming in and going out, keep this unceasingly on thy lips and in thy heart. In calling in this manner on the name of God thou wilt find peace, thou wilt attain to purity of spirit and body, and the Holy Spirit, the Origin of all good things, will dwell in thee, and He will guide thee unto holiness, unto all piety and purity."
Saint Seraphim of Sarov