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.
Dmitri MendeleevWork, 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.
Dmitri MendeleevNo law of nature, however general, has been established all at once; its recognition has always been preceded by many presentiments.
Dmitri Mendeleev