I really don't think life is about the I-could-have-beens. Life is only about the I-tried-to-do. I don't mind the failure but I can't imagine that I'd forgive myself if I didn't try.
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It is not because the truth is too difficult to see that we make mistakes… we make mistakes because the easiest and most comfortable course for us is to seek insight where it accords with our emotions – especially selfish ones.