“I have made up my mind to like no novels really, but Miss Edgeworth's, yours and my own.”

Bk. 1, Ch. "Paradox, Next Stop After the Boondocks
The Shockwave Rider (1975)

What Must We Do To Be Saved? (1880) http://www.gutenberg.org/files/38801/38801-h/38801-h.htm Section XI, "What Do You Propose?"
Context: I have made up my mind that if there is a God, he will be merciful to the merciful.
Upon that rock I stand.
That he will not torture the forgiving.
Upon that rock I stand.
That every man should be true to himself, and that there is no world, no star, in which honesty is a crime.
Upon that rock I stand.
The honest man, the good woman, the happy child, have nothing to fear, either in this world or the world to come.
Upon that rock I stand.

1974
1970's, interview, K. Horsfield & L. Blumenthal

Source: The Bell Jar

As quoted in Making a Habit of Success: How to Make a Habit of Succeeding, How to Win With High Self-Esteem (1999) by MacK R. Douglas, p. 45. Unsourced variant: What this power is, I cannot say. All I know is that it exists... and it becomes available only when you are in that state of mind in which you know exactly what you want...and are fully determined not to quit until you get it.
Context: I had made up my mind to find that for which I was searching even if it required the remainder of my life. After innumerable failures I finally uncovered the principle for which I was searching, and I was astounded at its simplicity. I was still more astounded to discover the principle I had revealed not only beneficial in the construction of a mechanical hearing aid but it served as well as means of sending the sound of the voice over a wire. Another discovery which came out of my investigation was the fact that when a man gives his order to produce a definite result and stands by that order it seems to have the effect of giving him what might be termed a second sight which enables him to see right through ordinary problems. What this power is I cannot say; all I know is that it exists and it becomes available only when a man is in that state of mind in which he knows exactly what he wants and is fully determined not to quit until he finds it.

Source: Running with Scissors

"What Has Become"
For Whom The Troubadour Sings (2010)