Being is so significant that it is irreplaceable. You are just yourself. Do something that comes out of you - not to assert, but to express! Sing your song, dance your dance, rejoice in being whatever nature has chosen you to be.
Wonder, and its expression in poetry and the arts, are among the most important things which seem to distinguish men from other animals, and intelligent and sensitive people from morons.
The point, which can hardly be repeated too often, is that differentiation is not separation. The head and the feet are different, but not separate, and though man is not connected to the universe by exactly the same physical relation as branch to tree or feet to head, he is nonetheless connected - and by physical relations of fascinating complexity.
Don't waste life in doubts and fears; spend yourself on the work before you, well assured that the right performance of this hour's duties will be the best preparation for the hours and ages that will follow it.
Tomorrow and plans for tomorrow can have no significance at all unless you are in full contact with the reality of the present, since it is in the present and only in the present that you live. There is no other reality than present reality, so that, even if one were to live for endless ages, to live for the future would be to miss the point everlastingly.