Quotes 1 till 3 of 3.
Henry David Thoreau
American writer 1817-1862+3
To be a philosopher is not merely to have subtle thoughts, nor even to found a school, but so to love wisdom as to live according to its dictates a life of simplicity, independence, magnanimity, and trust. It is to solve some of the problems of life, not only theoretically, but practically.
Robert A. Heinlein
American science fiction writer 1907-19880
Everything is theoretically impossible, until it is done.
American philosopher 1842-19100
Faith means belief in something concerning which doubt is theoretically possible.