Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.Charles Darwin
Every man is said to have his peculiar ambition. Whether it be true or not, I can say, for one, that I have no other so great as that of being truly esteemed of my fellow-men, by rendering myself worthy of their esteem. How far I shall succeed in gratifying this ambition is yet to be developed.Abraham Lincoln
When you are asked if you can do a job, tell 'em, 'Certainly I can!' Then get busy and find out how to do it.Theodore Roosevelt
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.Winston Churchill
I'm so fast that last night I turned off the light switch in my hotel room and was in bed before the room was dark.Muhammad Ali
Getting ahead in a difficult profession requires avid faith in yourself. That is why some people with mediocre talent, but with great inner drive, go so much further than people with vastly superior talent.Sophia Loren