The eternal silence of these infinite spaces terrifies me - Blaise Pascal

He that takes truth for his guide, and duty for his end, may safely trust to God's providence to lead him aright

Rules for Demonstrations. I. Not to undertake to demonstrate any thing that is so evident of itself that nothing can be given that is clearer to prove it. II. To prove all propositions at all obscure, and to employ in their proof only very evident maxims or propositions already admitted or demonstrated. III. To always mentally substitute definitions in the place of things defined, in order not to be misled by the ambiguity of terms which have been restricted by definitions.

It is not the length of years but a multitude of generations that makes things obscure. For truth is only perverted when men change.