"Sharpen your interest in two major subjects: life and people. You will only gather information from a source if you are interested in it." -– Jim Rohn  

"Curiosity is one of the permanent and certain characteristics of a vigorous mind." -- Samuel Johnson  

"In spite of illness, in spite even of the archenemy sorrow, one can remain alive long past the usual date of disintegration if one is unafraid of change, insatiable in intellectual curiosity, interested in big things, and happy in small ways." -- Edith Wharton  

"The mark of a truly civilized man is confidence in the strength and security derived from the inquiring mind." -- Felix Frankfurter