“To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.”

“In the midst of all dwells the Sun. For who could set this luminary in another or better place in this most glorious temple, than whence he can at one and the same time brighten the whole.”

“The earth together with its surrounding waters must in fact have such a shape as its shadow reveals, for it eclipses the moon with the arc of a perfect circle.”

“In so many and such important ways, then, do the planets bear witness to the earth's mobility.”

“For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study.”

“Therefore, when I considered this carefully, the contempt which I had to fear because of the novelty and apparent absurdity of my view, nearly induced me to abandon utterly the work I had begun.”

“I sought to hear the voice of God and climbed the topmost steeple, but God declared: "Go down again - I dwell among the people.”

“We limit ourselves and God who wants to work through us”

“God can only work through those who have totally identified themselves with His will and purpose”

“I am not saying that Hitler was a choir boy. But I am saying, let him who was innocent in the Second World War cast the first stone.”

“Who I am as a guitarist is defined by my failure to become Jimi Hendrix.”

“Pride is ugly. It says, 'If you succeed, I am a failure.'”

“If you want something new, you have to stop doing something old”

“I can't understand why people are frightened of new ideas. I'm frightened of the old ones.”

“Each voice carries a portion of value, no matter how unpalatable or distasteful that voice may be: no one person, government, ideology, transnational, or religious institution can own and dominate ...”