“The world can doubtless never be well known by theory: practice is absolutely necessary.”
“It is absolutely necessary... for me to have persons that can think for me, as well as execute orders.”
“In theory, there is no difference between theory and practice. But in practice, there is.”
“Unfortunately for the good sense of mankind, the fact of their fallibility is far from carrying the weight in their practical judgement, which is always allowed to it in theory; for while every one well knows himself to be fallible, few think it necessary to take any precautions against their own fallibility. ”
“We must never assume that local practice conforms with state theory.”
“Where secrecy is known to exist one can never be absolutely sure that he knows the complete truth." Edward U. Condon”