Do not imitate one another's style. If you do, so far as your art is concerned you will be called a grandson, rather than the son of Nature. It is always best to have recourse to nature, which is replete with such abundance of objects, than to the productions of other masters, who learnt everything from her.

Necessity is the mistress and guide of nature.

The false interpreters of nature declare that quicksilver is the common seed of every metal, not remembering that nature varies the seed according to the variety of the things she desires to produce in the world.

Those who are inspired by a model other than Nature, labor in vain.

Experiment is the sole interpreter of the artifices of Nature.

Vitality and beauty are gifts of Nature for those who live according to its laws.