“Nature does not proceed by leaps.”

If you do not know the names of things, the knowledge of them is lost, too.

Natural bodies are divided into three kingdomes of nature: viz. the mineral, vegetable, and animal kingdoms. Minerals grow, Plants grow and live, Animals grow, live, and have feeling.

It is not God, but people themselves who shorten their lives by not keeping physically fit.

A practical botanist will distinguish at the first glance the plant of the different quarters of the globe and yet will be at a loss to tell by what marks he detects them.

The species and the genus are always the work of nature [i.e. specially created]; the variety mostly that of circumstance; the class and the order are the work of nature and art.

The plant kingdom covers the entire earth, offering our senses great pleasure and the delights of summer.

Blessed be the Lord for the beauty of summer and spring, for the air, the water, the verdure, and the song of birds.

No one has been a greater botanist or zoologist. No one has written more books, more correctly, more methodically, from personal experience. No one has more completely changed a whole science and started a new epoch.

It is the genus that gives the characters, and not the characters that make the genus.

If a tree dies, plant another in its place.

Stones grow, plants grow, and live, animals grow live and feel.

When all the thoughts are concerning one thing and the person loses interest in other things, the melancholy begins.

This drink has a magical power. It strengthens the weak, and revives those who have fainted. Those tired after work and physical activity can return their life forces by this drink much sooner than by nourishment. It works as a diuretic, an appetizer, an antitoxin.

As one sits here in summertime and listens to the cuckoo and all the other bird songs, the crackling and buzzing of insects, as one gazes at the shining colors of flowers, doth one become dumbstruck before the Kingdom of the Creator.

To live by medicine is to live horribly.

There is no generation from an egg in the Mineral Kingdom. Hence no vascular circulation of the humours as in the remaining Natural Kingdoms.

If one truly loves nature one finds beauty everywhere.

Man is least himself when he talks in his own person. Give him a mask, and he will tell you the truth.

We know well that mistakes are more easily detected in the works of others than in one’s own.

What a book a devil’s chaplain might write on the clumsy, wasteful, blundering, low, and horribly cruel work of nature!

Talk sense to a fool and he calls you foolish.

So don’t you worry your pretty little mind because people throw rocks at things that shine.

Everyone asks if a man is rich, no one if he is good.

Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more.