One of my favorite quotes is this one by Rainer Maria Rilke:
"...I want to beg you, as much as I can, dear sir, to be patient toward all that is unsolved in your heart and to try to love the questions themselves like locked rooms and like books that are written in a very foreign tongue. Do not now seek the answers, which cannot be given you because you would not be able to live them. And the point is, to live everything. Live the questions now. Perhaps you will then gradually, without noticing it, live along some distant day into the answer."
I heard it first in the homily of a very literate Episcopalian priest and was immediately struck by it. I am a person who, unlike my brother and some other more clear-headed people I have known, has not always felt certain of the answers to life's questions. This quote has always helped me to feel that uncertainty is okay.