Chemistry, in its application to animals and vegetables. Endeavours jointly with physiology to enlighten us respecting the mysterious processes and sources of organic life.

If you want to become a chemist, you will have to ruin your health. If you don't ruin your health studying, you won't accomplish anything these days in chemistry. Liebig's advice to Kekulé.

Chocolate is a perfect food, as wholesome as it is delicious, a beneficent restorer of exhausted power...it is the best friend of those engaged in literary pursuits.

The secret of all those who make discoveries is that they regard nothing as impossible.

Observation is like a piece of glass, which, as a mirror, must be very smooth, and must be very carefully polished, in order that it may reflect the image pure and undistorted.

The more fodder, the more flesh; the more flesh, the more manure; the more manure, the more grain.

A fact acquires its true and full value only through the idea which is developed from it.

If it is impossible to judge merit and guilt in the field of natural science, then it is not possible in any field, and historical research becomes an idle, empty activity.

The progress of mankind is due exclusively to the progress of natural sciences, not to morals, religion or philosophy.

In the progressive growth of astronomy, physics or mechanical science was developed, and when this had been, to a certain degree, successfully cultivated, it gave birth to the science of chemistry.

In this apparatus is nothing new but its simplicity and thorough trustworthiness. On his revolutionary method of organic analysis.

To love is to communicate, and you can communicate only in truth. Speak the truth, and speak it with love.

We are not just tickling the dragon’s tail

The happy people are failures because they are on such good terms with themselves they don't give a damn.

After a disappointing summer, Humpty Dumpty has a great fall.

The history of my stupidity would fill many volumes.

Can thought be silent?

[My novels] introduce levels of intelligence ... moral doubt [and] self-doubt, which may not pertain [to real-world espionage].

We change who we are to fit the exogenous of our time, and not just strategically or to our own advantage, sometimes sympathetically without our even knowing it for the betterment of the whole group.

People get ready...Jesus is coming!

I never had, or wished for, power over you. That isn't true, of course. I wanted the greatest power of all. but not advantage, or authority.