My Child, do not trust in your present feeling, for it will soon give way to another. As long as you live on this earth you will be subject to changeableness in spite of yourself. You will become merry at one time and sad another, noe peaceful but again disturbed, at one moment devout and the next indevout, sometimes diligent while at other times lazy, noe grave and again flippant.
Standing superior to these changes
But the man who is wise and whose spirit is well instructed stands superior to these changes. He pays no attention to what he feels in himself or from what quarter the wind of fickleness blows, so long as the whole intention of his mind is conducive to his proper and desired end. For thus he can stand undivided, unchanged, and unshaken, with the singleness of his intention directed unwaveringly toward Me, even in so many changing events. And the purer this singleness of intention is, with so much more constancy does he pass through many storms.
The eye of your intention must be free from interference
But in many ways the eye of pure intention grows dim, because it is attracted to any outwardly delightful thing that it meets. Indeed, it is rare to find one who is entirely free from all taint of self-seeking. The Jews of old, for example, came to Bethany to Martha and Mary, not for Jesus’ sake alone, but in order to see Lazarus.
The eye of your intention, therefore, must be cleansed so that it is single and right. It must be directed towards Me, despite all the objects which may interfere.
– From: The Imitation of Christ by Thomas à Kempis