Wolfgang Ostwald quotes:

A catalyst is a substance which alters the velocity of a chemical reaction without appearing in the final products.

Non-aqueous solutions don't conduct.

Happiness is equal to work minus resistance.

I must consider the organizer as more important than the discoverer.

The chemists work with inaccurate and poor measuring services, but they employ very good materials. The physicists, on the other hand, use excellent methods and accurate instruments, but they apply these to very inferior materials. The physical chemists combine both these characteristics in that they apply imprecise methods to impure materials.

The only difference between elements and compounds consists in the supposed impossibility of proving the so-called elements to be compounds.

What we call matter is only a complex of energies which we find together in the same place.