Every act of will is an act of self-limitation. To desire action is to desire limitation. In that sense, every act is an act of self-sacrifice. When you choose anything, you reject everything else.
...I will praise the English climate till I die—even if I die of the English climate. There is no weather so good as English weather. Nay, in a real sense there is no weather at all anywhere but in England. In France you have much sun and some rain; in Italy you have hot winds and cold winds; in Scotland and Ireland you have rain, either thick or thin; in America you have hells of heat and cold, and in the Tropics you have sunstrokes varied by thunderbolts. But all these you have on a broad and brutal scale, and you settle down into contentment or despair.
I have myself a poetical enthusiasm for pigs, and the paradise of my fancy is one where pigs have wings. But it is only men, especially wise men, who discuss whether pigs can fly; we have no particular proof that pigs ever discuss it.
Dogma is actually the only thing that cannot be separated from education. It IS education. A teacher who is not dogmatic is simply a teacher who is not teaching. There are no uneducated people; only most people are educated wrong. The true task of culture today is not a task of expansion, but of selection-and-rejection. The educationist must find a creed and teach it.