We Know More Than We Can Tell.

No Inanimate Object Is Ever Fully Determined By The Laws Of Physics And Chemistry.

Discoveries Are Made By Pursuing Possibilities Suggested By Existing Knowledge.

While Tacit Knowledge Can Be Possessed By Itself, Explicit Knowledge Must Rely On Being Tacitly Understood And Applied. Hence All Knowledge Is Either Tacit Or Rooted In Tacit Knowledge. A Wholly Explicit Knowledge Is Unthinkable.

The Amount Of Knowledge Which We Can Justify From Evidence Directly Available To Us Can Never Be Large. The Overwhelming Proportion Of Our Factual Beliefs Continue Therefore To Be Held At Second Hand Through Trusting Others, And In The Great Majority Of Cases Our Trust Is Placed In The Authority Of Comparatively Few People Of Widely Acknowledged Standing.

The Process Of Philosophic And Scientific Enlightenment Has Shaken The Stability Of Beliefs Held Explicitly As Articles Of Faith.