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"Trouble is only opportunity in work clothes."

"When your work speaks for itself, don't interrupt."

"Children are very nice observers, and will often perceive your slightest defects. In general, those who govern children, forgive nothing in them, but everything in themselves."

"It's the opinion of some that crops could be grown on the moon. Which raises the fear that it may not be long before we're paying somebody not to."

"I must say, to die with one's sword still sheathed is most regrettable."

"When you have faults, do not fear to abandon them."

"God is always on the side of the big battalions."

"Concern for man himself and his fate must always form the chief interest of all technical endeavor. Never forget this in the midst of your diagrams and equations."