If thou will be well with God, and have grace to rule thy life, and come to the joy of love, this name Jesu fasten to it so fast in thy heart that it come never out of thy thought. And when thou speakest to him and sayest 'Jesu', through custom, it shall be in thy ear joy, in thy mouth honey, and in thy heart melody. . . . If thou think Jesu continually and hold it stably [steadily], it purges thy sin and kindles thy heart; it clarifies thy soul, it removes anger, and does away sloth; it wounds in love and fullness of charity; it chases the devil, and puts out the dread; it opens heaven and makes a contemplative man. Have in mind Jesu; for all vices and phantoms it puts out from the lover.
Richard Rolle: The Form of Living.