You will never be happy if you continue to search ...

Alas, after a certain age every man is responsible for his face.

The only real progress lies in learning to be wrong all alone.

Ah, mon cher, for anyone who is alone, without God and without a master, the weight of days is dreadful.

It were a real increase of human happiness, could all young men from the age of nineteen be covered under barrels, or rendered otherwise invisible and there left to follow their lawful studies and callings, till they emerged, sadder and wiser, at the age of twenty-five.

Oh, if I had been loved at the age of seventeen, what an idiot I would be today. Happiness is like smallpox: if you catch it too soon, it can completely ruin your constitution.

You get to a certain age where you prepare yourself for happiness. Sometimes you never remember to actually get happy.

I learned from a very young age that if I pursued the things that truly excited me, that they would reward in more important ways, like happiness.

Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young.

There is a fountain of youth: it is your mind, your talents, the creativity you bring to your life and the lives of people you love. When you learn to tap this source, you will truly have defeated age.

Life would be infinitely happier if we could only be born at the age of eighty and gradually approach eighteen.

Probably the happiest period in life most frequently is in middle age, when the eager passions of youth are cooled, and the infirmities of age not yet begun as we see that the shadows, which are at morning and evening so large, almost entirely disappear at midday.