"Before anything else, preparation is the key to success."

"Sometimes we stare so long at a door that is closing that we see too late the one that is open."

"When one door closes another door opens; but we so often look so long and so regretfully upon the closed door, that we do not see the ones which open for us."

“If you're walking down the right path and you're willing to keep walking, eventually you'll make progress.” 

“I'm inspired by the people I meet in my travels--hearing their stories, seeing the hardships they overcome, their fundamental optimism and decency. I'm inspired by the love people have for their children. And I'm inspired by my own children, how full they make my heart. They make me want to work to make the world a little bit better. And they make me want to be a better man.” 

“A lot of shelter dogs are mutts like me.” 

“My little girls can break my heart. They can make me cry just looking at them eating their string beans.” 

Yes we can!” 

“I have not need to promise what I cannot do.” 

“Give me an answer which is plain to understand.” 

“Words are doctors for the diseased temper.” 

“His resolve is not to seem, but to be, the best.” 

“I gave them hope, and so turned away their eyes from death” 

“There is no avoidance in delay.” 

“My will is mine...I shall not make it soft for you.” 

“The best way to control the opposition is to lead it ourselves.” 

“Logic is the science not of external forms of thought, but of the laws of development "of all material, natural and spiritual things", i.e., of the development of the entire concrete content of the world and of its cognition, i.e., the sum-total, the conclusion of the History of knowledge of the world.” 

“It is necessary sometimes to take one step backward to take two steps forward.” 

One never notices what has been done; one can only see what remains to be done. 

One of our pleasures was to enter our workshop at night; then, all around us we would see the luminous silhouettes of the beakers and capsules that contained our products. 

There is nothing more wonderful than being a scientist, nowhere I would rather be than in my lab, staining up my clothes and getting paid to play. 

You’ll never make me believe women were made to walk on stilts. 

“Your own soul is nourished when you are kind; it is destroyed when you are cruel.”

“If you see oppression of the poor, and justice and righteousness trampled in a country, do not be astounded.”