"An artist must possess Nature. He must identify himself with her rhythm, by efforts that will prepare the mastery which will later enable him to express himself in his own language."
"Courage is resistance to fear, mastery of fear, not absence of fear."
"We need to tap the resource of current and retiring science and math professionals that have both content mastery and the practical experience to serve as effective teachers."
"The central task of science is to arrive, stage by stage, at a clearer comprehension of nature, but this does not at all mean, as it is sometimes claimed to mean, a search for mastery over nature."
"Wisdom does not show itself so much in precept as in life - in firmness of mind and a mastery of appetite. It teaches us to do as well as to talk and to make our words and actions all of a color."
"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."
"We talk of our mastery of nature, which sounds very grand but the fact is we respectfully adapt ourselves, first, to her ways."
"Only one who devotes himself to a cause with his whole strength and soul can be a true master. For this reason mastery demands all of a person."
"Roman civilization had achieved, within the bounds of its technology, relatively as great a mastery of time and space as we have achieved today."
"For good or for ill, air mastery is today the supreme expression of military power and fleets and armies, however vital and important, must accept a subordinate rank."