Who said "A man's own conscience should be his first law."?

This quote is attributed to Spencer, Herbert.

A man's own conscience should be his first law. - Spencer, Herbert

"A man's own conscience should be his first law."

Spencer, Herbert Justice

Philosopher-Sociologist English 1820–1903

"The great aim of education is not knowledge but action."

"Progress, therefore, is not an accident, but a necessity."

"Time is that which man is always trying to kill, but which ends in killing him."

"Science is organized knowledge."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."