It takes strong ears indeed to hear ourselves judged frankly, and because there are few who can endure criticism without being stung by it, those who venture to criticize us perform a remarkable act of friendship. For it is a healthy love that will risk wounding or offending in order to profer a benefit.

There are few things on which we can pass a sincere judgement, because there are few things in which we have not, in one way or another, a particular interest.

As far as I am concerned, no road that would lead us to health is either arduous or expensive.

Custom is a violent and treacherous school mistress. She, by little and lithe, slyly and unperceived, slips in the foot of her authority; but having by this gentle and humble beginning, with the benefit of time, fixed and established it, she then unmasks a furious and tyrannic countenance, against which we have no more the courage or the power so much as to lift up our eyes.

The world always looks straights ahead; as for me, I turn my gaze inward, I fix it there and keep it busy. Everyone looks in front of him: as for me, I look inside me: I have no business but with myself; I continually observe myself, I take stock of myself, I taste myself. Others...they always go forward; as for me, I roll about in myself.

There is no desire more natural than the desire of knowledge. (Il n'est desir plus naturel que le desir de connaissance)

We are neither obstinately nor wilfully to oppose evils, nor truckle under them for want of courage, but that we are naturally to give way to them, according to their condition and our own, we ought to grant free passage to diseases; and I find they stay less with me who let them alone. And I have lost those which are reputed the most tenacious and obstinate of their own defervescence, without any help or art, and contrary to their rules. Let us a little permit nature to take her own way; she better understands her own affairs than we.