“What distinguishes knowledge is not certainty but evidence.”

“In our worship of certainty we must distinguish between the sound certainty and the sham, between what is gold and what is tinsel; and then, when certainty is attained, we must remember that it is not the only good; that we can buy it at too high a price; that there is danger in perpetual quiescence as well as in perpetual motion; and that a compromise must be found in a principle of growth.”

“It is not what the man of science believes that distinguishes him, but how and why he believes it. His beliefs are tentative, not dogmatic; they are based on evidence, not on authority or intuition.”

“Is there any evidence to the contrary? I don’t need certainty in order to act on a well-founded suspicion.”

“Faith, n. Belief without evidence in what is told by one who speaks without knowledge, of things without parallel.”

“At bottom, knowledge of God in faith is always this indirect knowledge of God, knowledge of God in His works, and in these particular works in the determining and using of certain creaturely realities to bear witness to the divine objectivity. What distinguishes faith from unbelief, erroneous faith and superstition is that it is content with this indirect knowledge of God.”

“In an economy where the only certainty is uncertainty, the one sure source of lasting competitive advantage is knowledge.”

“In our reasonings concerning matter of fact, there are all imaginable degrees of assurance, from the highest certainty to the lowest species of moral evidence..”

“The core of science is not a mathematical modeling--it is intellectual honesty. It is a willingness to have our certainties about the world constrained by good evidence and good argument.”

“It is appropriate to distinguish between a knowledge that is active and mental, namely doctrinal discernment, by which we become conscious of the Truth, and a knowledge that is passive, receptive and cardiac, namely invocatory contemplation, by which we assimilate what we have become aware of.”