"The true and proper object of a free government is the greatest happiness of the greatest number."

"The sole end for which mankind are warranted, individually or collectively, in interfering with the liberty of action of any of their number, is self-protection."

"The human mind, when it is in a healthy state, is never satisfied with having attained a certain measure of truth; it is always aspiring to a higher."

"It is not because men's desires are strong that they act ill; it is because their consciences are weak."

"A person may cause evil to others not only by his actions but by his inaction, and in either case he is justly accountable to them for the injury."