Everything Is Self-evident.

Science Is Practical Philosophy.

... Moral Certainty Is Certainty Which Is Sufficient To Regulate Our Behaviour, Or Which Measures Up To The Certainty We Have On Matters Relating To The Conduct Of Life Which We Never Normally Doubt, Though We Know That It Is Possible, Absolutely Speaking, That They May Be False.

For To Be Possessed Of A Vigorous Mind Is Not Enough; The Prime Requisite Is Rightly To Apply It.

I Can Doubt Everything, Except One Thing, And That Is The Very Fact That I Doubt. Simply Put - I Think, Therefore I Am

For How Do We Know That The Thoughts Which Occur In Dreaming Are False Rather Than Those Others Which We Experience When Awake, Since The Former Are Often Not Less Vivid And Distinct Than The Latter?