“I hold that the mark of a genuine idea is that its possibility can be proved, either a priori by conceiving its cause or reason, or a posteriori when experience teaches us that it is in fact in nature.”

To love is to find pleasure in the happiness of others.

The art of discovering the causes of phenomena, or true hypotheses, is like the art of deciphering, in which an ingenious conjecture often greatly shortens the road.

There never is absolute birth nor complete death, in the strict sense, consisting in the separation of the soul from the body. What we call births are developments and growths, while what we call deaths are envelopments and diminutions.

The past is pregnant with the present.

Everything that is possible demands to exist.

I have said more than once, that I hold space to be something purely relative, as time; an order of coexistences, as time is an order of successions.

I am convinced that the unwritten knowledge scattered among men of different callings surpasses in quantity and in importance anything we find in books, and that the greater part of our wealth has yet to be recorded.

The knowledge which we have acquired ought not to resemble a great shop without order, and without an inventory; we ought to know what we possess, and be able to make it serve us in need.

Each portion of matter may be conceived of as a garden full of plants, and as a pond full of fishes. But each branch of the plant, each member of the animal, each drop of its humors, is also such a garden or such a pond.

I am so in favor of the actual infinite that instead of admitting that Nature abhors it, as is commonly said, I hold that Nature makes frequent use of it everywhere, in order to show more effectively the perfections of its Author.

The words ‘Here you can find perfect peace’ can be written only over the gates of a cemetery.

The world is not a machine. Everything in it is force, life, thought.

It is God who is the ultimate reason things, and the Knowledge of God is no less the beginning of science than his essence and will are the beginning of things.

Indeed in general I hold that there is nothing truer than happiness, and nothing happier and sweeter than truth.

To love is to place happiness in the heart of another.

It is necessary to believe that the mixture of evil has produced the greatest possible good: otherwise the evil would not have been permitted.

Our feelings are our most genuine paths to knowledge.

People who make you laugh, who help you when you’re in need. People who genuinely care. They are the ones worth keeping in your life. Everyone else is just passing through.

Do not think that love, in order to be genuine, has to be extraordinary. What we need is to love without getting tired.

If you want the cooperation of humans around you, you must make them feel they are important – and you do that by being genuine and humble.

I hope for better things, and I thank God the world is also full of people who want to be genuine and kind.

Genuine wisdom is usually conspicuous through modesty and silence.

A genuine, affectionate smile is very important in our day-to-day lives.

We humans have lost the wisdom of genuinely resting and relaxing. We worry too much. We don’t allow our bodies to heal, and we don’t allow our minds and hearts to heal.