I have achieved an inner freedom.

The elements which are the most widely diffused have small atomic weights.

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.

Work, look for peace and calm in work: You will find it nowhere else. Pleasures flit by -- they are only for yourself; work leaves a mark of long-lasting joy, work is for others.

No law of nature, however general, has been established all at once; its recognition has always been preceded by many presentiments.

If all the elements are arranged in the order of their atomic weights, a periodic repetition of properties is obtained. This is expressed by the law of periodicity.

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