The person who has lived the most is not the one with the most years but the one with the richest experiences.

Nothing is less in our power than the heart, and far from commanding we are forced to obey it.

Let the trumpet of the day of judgment sound when it will, I shall appear with this book in my hand before the Sovereign Judge, and cry with a loud voice, This is my work, there were my thoughts, and thus was I. I have freely told both the good and the bad, have hid nothing wicked, added nothing good.

I love idleness. I love to busy myself about trifles, to begin a hundred things and not finish one of them, to come and go as my fancy bids me, to change my plan every moment, to follow a fly in all its circlings, to try and uproot a rock to see what is underneath, eagerly to begin a ten-years' task to give it up after ten minutes: in short, to fritter away the whole day inconsequentially and incoherently, and to follow nothing but the whim of the moment.

Too much apparatus, designed to guide us in experiments and to supplement the exactness of our senses, makes us neglect to use those senses...The more ingenious our apparatus, the coarser and more unskillful are our senses. We surround ourselves with tools and fail to use those which nature has provided every one of us.

Chemistry... is like the maid occupied with daily civilisation; she is busy with fertilisers, medicines, glass, insecticides ... for she dispenses the recipes.

Supreme happiness consists in self-content.