"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."

"When we see the order of the elements, we must admit that there is a higher reason."

"Experiment itself cannot give truth, but it gives the means of destroying erroneous representations whilst confirming those which are true in all their consequences."

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

"The progress of science is a series of corrections."