“We know the truth, not only be the reason, but also be the heart.”

“We know the truth not only through our reason but also through our heart. It is through the latter that we know first principles, and reason, which has nothing to do with it, tries in vain to refute them.”

“Faith and reason are like two wings on which the human spirit rises to the contemplation of truth; and God has placed in the human heart a desire to know the truth- in a word, to know himself- so that, by knowing and loving God, men and women may also come to the fullness of truth about themselves.”

“Do not think that we say that these things are only to be received by faith, but also that they are to be asserted by reason. For indeed it is not safe to commit these things to bare faith without reason, since assuredly truth cannot be without reason.”

“Our aim as scientists is objective truth; more truth, more interesting truth, more intelligible truth. We cannot reasonably aim at certainty. Once we realize that human knowledge is fallible, we realize also that we can never be completely certain that we have not made a mistake.”

“For though, as we have said, all children are heartless, this is not precisely true of teenagers. Teenage hearts are raw and new, fast and fierce, and they do not know their own strength. Neither do they know reason or restraint, and if you want to know the truth, a goodly number of grown-up hearts never learn it.”