Don't be angry at what you can't have. Be angry about what you could have had, but you were too naive to achieve.

- Вот она, истина. Не в серпе и молоте. Не в звездах и полосах. Не в распятии. Не в солнце. Не в золоте. Не в инь и ян. В улыбке.

The meaning of life is life.

I don't know the meaning of life. I don't know why we are here. I think life is full of anxieties and fears and tears. It has a lot of grief in it, and it can be very grim. And I do not want to be the one who tries to tell somebody else what life is all about. To me it's a complete mystery.

You haven’t realized it yet but your life is precious. I always say that people should not do something that has no purpose. Is there a purpose behind your actions? Of course there is a purpose behind your decision to step into this bamboo forest. That is why your life is not meaningless.
--The Unnamed Samurai (Chapter 5)

Man must learn to know the universe precisely as it is, or he cannot successfully find his place in it. A man should therefore use his reasoning faculty in all matters involving truth, and especially as concerning his religion. He must learn to distinguish between truth and error.