Certain Truths are Self Evident

Prop. 47"Trath is one, and so is light,
Yet how many shades of it."

Self Evidency (Euclid's First Common Notion)

''Things that are equal to the same things are equal to each other.''

This is an example of something that is self-evident. Abraham Lincoln and before him the founding fathers knew this simple, 2000 year old law of mechanics as it applied to humanity.

to wit:

''We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. — That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed...'' - IN CONGRESS, JULY 4, 1776

The unanimous Declaration of the thirteen united States of America