A plant is like a self-willed man, out of whom we can obtain all which we desire, if we will only treat him his own way.

Nothing is more damaging to the truth than an old error.

A resolution that is communicated is no longer within thy power; thy attentions become now the plaything of chance; he who would have his commands certainly carried out must take man by surprise.

Those that are firm in their will mold the world to themselves.

The misfortune in the state is, that nobody can enjoy life in peace, but that everybody must govern; and in art, that nobody will enjoy what has been produced, but that every one wants to reproduce on his own account.

Normally, the sciences distance themselves from life and the return to it via a detour.

No wise combatant underestimates their antagonist.