A great deal may be done by severity, more by love, but most by clear discernment and impartial justice.

A person places themselves on a level with the ones they praise.

Mathematicians are like Frenchmen: whatever you say to them they translate into their own language and forthwith it is something entirely different.

The moment one definitely commits oneself, then Providence moves too. Whatever you think you can do, or believe you can do, begin it. Action has magic, power and grace.

Most pioneers are at the mercy of doubt at the beginning, whether of their worth, of their theories, or of the whole enigmatic field in which they labour.

I have always paid attention to the merits of my enemies, and found it an advantage.

Come my little one, and give me your hand.