There exists everywhere a medium in things, determined by equilibrium.

The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.

I have to talk like this! It`s my job

The most all penetrating spirit before which will open the possibility of tilting not tables, but planets, is the spirit of free human inquiry. Believe only in that.

The edifice of science not only requires material, but also a plan. Without the material, the plan alone is but a castle in the air-a mere possibility; whilst the material without a plan is but useless matter.

We must expect the discovery of many as yet unknown elements-for example, elements analogous to aluminum and silicon- whose atomic weight would be between 65 and 75.

I have achieved an inner freedom.