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“To comprehend a man’s life, it is necessary to know not merely what he does but also what he purposely leaves undone.

There is a limit to the work that can be got out of a human body or a human brain, and he is a wise man who wastes no energy on pursuits for which he is not fitted; and he is till wiser who, from among the things that he can do well, chooses and resolutely follows the best.”

 John Hall Gladstone


John Hall Gladstone  (7 March 1827 – 6 October 1902) was a British chemist. He served as President of thePhysical Society between 1874 and 1876 and during 1877–1879 was President of the Chemical Society. Apart from chemistry, where one of his most notable publications was on bromination of rubber, he undertook pioneering work in optics and spectroscopy.

Source, Wikipedia October 26, 2011