Madam, I have come from a country where people are hanged if they talk.

You'll understand when you've forgotten what you understood before

It is within you that the ghosts acquire voices.

The universe is the mirror in which we can contemplate only what we have learned to know in ourselves

It is not the voice that commands the story: it is the ear.

A classic is a book that has never finished saying what it has to say.

A function of a variable quantity is an analytic expression composed in any way whatsoever of the variable quantity and numbers or constant quantities.

After exponential quantities the circular functions, sine and cosine, should be considered because they arise when imaginary quantities are involved in the exponential.

Transcendental [numbers], They transcend the power of algebraic methods.

To those who ask what the infinitely small quantity in mathematics is, we answer that it is actually zero. Hence there are not so many mysteries hidden in this concept as they are usually believed to be.

Now I will have less distraction.

Nothing takes place in the world whose meaning is not that of some maximum or minimum.

For the sake of brevity, we will always represent this number 2.718281828459... by the letter e.

Logic is the foundation of the certainty of all the knowledge we acquire.

Justice is a charity in accordance with wisdom.

Taking mathematics from the beginning of the world to the time when Newton lived, what he had done was much the better half.

Nature does not make leaps.

The present is big with the future, the future might be read in the past, the distant is expressed in the near.

Every present state of a simple substance is the natural consequence of its preceding state, in such a way that its present is big with its future.