“If you permit your thoughts to dwell on evil you yourself will become ugly. Look only for the good in everything so you absorb the quality of beauty.”

Source: The Neverending Story

Source: Your Forces and How to Use Them (1912), Chapter 7, p. 115–116

Lisa Heiserman Perkins NYTimes http://www.nytimes.com/2011/03/01/science/01angier.html?_r=0
About

Source: Anam Cara: A Book of Celtic Wisdom

First Homily, as translated by John Burnaby (1955), p. 262
Ten Homilies on the First Epistle of John (414)

1950s, Conquering Self-centeredness (1957)
Context: I’ve seen people who discovered a great meaning in their jobs and they became so absorbed in that that they didn’t have time to become self-centered. They loved their job. And the great prayer that anyone could pray at that point is: “O God, help me to love my job as this individual loves his or hers. O God, help me to give my self to my work and to my job and to my allegiance as this individual does.” And this is the way out. And I think this is what [Ralph Waldo] Emerson meant when he said: “O, see how the masses of men worry themselves into nameless graves, while here and there, some great unselfish soul forgets himself into immortality.” And this becomes a point of balance when you can forget yourself into immortality. You’re not so absorbed in self, but you are absorbed in something beyond self.

Speech delivered at Bombay University Convocation on 17th August 1937.

§ IV
1910s, At the Feet of the Master (1911)
Context: See what gossip does. It begins with evil thought, and that in itself is a crime. For in everyone and in everything there is good; in everyone and in everything there is evil. Either of these we can strengthen by thinking of it, and in this way we can help or hinder evolution; we can do the will of the Logos or we can resist Him. If you think of the evil in another, you are doing at the same time three wicked things:
(1) You are filling your neighbourhood with evil thought instead of with good thought, and so you are adding to the sorrow of the world.
(2) If there is in that man the evil which you think, you are strengthening it and feeding it; and so you are making your brother worse instead of better. But generally the evil is not there, and you have only fancied it; and then your wicked thought tempts your brother to do wrong, for if he is not yet perfect you may make him that which you have thought him.
(3) You fill your own mind with evil thoughts instead of good; and so you hinder your own growth, and make yourself, for those who can see, an ugly and painful object instead of a beautiful and lovable one.
Not content with having done all this harm to himself and to his victim, the gossip tries with all his might to make other men partners in his crime. Eagerly he tells his wicked tale to them, hoping that they will believe it; and then they join with him in pouring evil thought upon the poor sufferer. And this goes on day after day, and is done not by one man but by thousands. Do you begin to see how base, how terrible a sin this is? You must avoid it altogether.