Don't be a slave of your humours and complections

We should not nail ourselves so strongly to our humours and complexions. Our main talent lies in knowing how to adapt ourselves to a variety of customs. To keep ourselves bound by the bonds of necessity to one single way of life is to be, but not to live. Souls are most beautiful when they show most variety and flexibility.

If it was for me to train myself my way, there would be no mould in which I would wish to be set without being able to throw it off. Life is a rough, irregular progress with a multitude of forms. It is to be no friend of yourself - and even less master of yourself - to be a slave endlessly following yourself, so beholden to your predispositions that you cannot stray from them not bend them.

Michel de Montaigne - Essays, On tree kinds of social intercourse (III, 3)