“Accomplishment, the feeling of absorption in the flow, of mastery for its own sake, of knowing how to do this thing, is what keeps all of us doing what we do, if we like what we do at all.”

Source: Tertium Organum (1912; 1922), Ch. I
Context: The most difficult thing is to know what we do know, and what we do not know.
Therefore, desiring to know anything, we shall before all else determine WHAT we accept as given, and WHAT as demanding definition and proof; that is, determine WHAT we know already, and WHAT we wish to know.
In relation to the knowledge of the world and of ourselves, the conditions would be ideal could we venture to accept nothing as given, and count all as demanding definition and proof. In other words, it would be best to assume that we know nothing, and make this our point of departure.
But unfortunately such conditions are impossible to create. Knowledge must start from some foundation, something must be recognized as known; otherwise we shall be obliged always to define one unknown by means of another.

[Norris, K., The Cloister Walk, Penguin Publishing Group, 1997, 978-1-101-21566-1, http://books.google.com/books?id=pZkLNwpYcJ0C&pg=PT115]

Source: Heartbeat

Source: The Revolt of the Masses (1929), Chapter XI: The Self-Satisfied Age
Context: It is not that one ought not to do just what one pleases; it is simply that one cannot do other than what each of us has to do, has to be. The only way out is to refuse to do what has to be done, but this does not set us free to do something else just because it pleases us. In this matter we only possess a negative freedom of will, a noluntas. We can quite well turn away from our true destiny, but only to fall a prisoner in the deeper dungeons of our destiny. … Theoretic truths not only are disputable, but their whole meaning and force lie in their being disputed, they spring from discussion. They live as long as they are discussed, and they are made exclusively for discussion. But destiny — what from a vital point of view one has to be or has not to be — is not discussed, it is either accepted or rejected. If we accept it, we are genuine; if not, we are the negation, the falsification of ourselves. Destiny does not consist in what we feel we should like to do; rather is it recognised in its clear features in the consciousness that we must do what we do not feel like doing.

Source: A Wrinkle in Time