"Contrary to what most of us believe, happiness does not simply happen to us. It's something that we make happen, and it results from doing our best. Feeling fulfilled when we live up to our potentialities is what motivates differentiation and leads to evolution."

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I'm sorry, but I do hate this differentiation between the sexes. The modern girl has a thoroughly businesslike attitude to life! That sort of thing. It's not a bit true! Some girls are businesslike and some aren't. Some men are sentimental and muddle-headed, others are clear-headed and logical. There are just different types of brains.

— Agatha Christie