Frustration.

1. He who would not be frustrate of his hope to write well hereafter in laudable things ought himself to be a true poem. -John Milton.

2. Laughter and tears are both responses to frustration and exhaustion . . . . I myself prefer to laugh, since there is less cleaning up to do afterward. -Kurt Vonnegut.

3. Fears, indecision, and frustration feed on words. Without words they usually stop. . . . Words are at times good for looking back, but they are confining when I need to act in the present. -Hugh Prather.

4. I feel as if I were a piece in a game of chess, when my opponent says of it: That piece cannot be moved. -Soren Kierkegaard.