If you don't begin to be a revolutionist at the age of twenty, then at fifty you will be a most impossible old fossil. If you area red revolutionary at the age of twenty, you have some chance of being up-to-date when you are forty!
I like to go back and read poems that I wrote fifty years ago, twenty years ago, and sometimes they surprise me - I didn't know I knew that then. Or maybe I didn't know it then, and I know more now.
Now I know That twenty centuries of stony sleep Were vexed to nightmare by a rocking cradle, And what rough beast, its hour come round at last, Slouches towards Bethlehem to be born?
One of the oddest things in life, as we all know, is the way that when you have heard a thing mentioned, within twenty-four hours you nearly always come across it again.