For the power given to Congress by the Constitution does not extend to the internal regulation of the commerce of a State (that is to say, of the commerce between citizen and citizen,) which remain exclusively with its own legislature; but to its external commerce only, that is to say, its commerce with another State, or with foreign nations, or with the Indian tribes.

Always take hold of things by the smooth handle.

Our civil rights have no dependence upon our religious opinions more than our opinions in physics or geometry.

[I]n Great-Britain it is said that their constitution relies on the house of commons for honesty, and the lords for wisdom; whichwould be a rational reliance if honesty were to be bought with money, and if wisdom were hereditary.

A properly functioning democracy depends on an informed electorate.

Reading, reflection and time have convinced me that the interests of society require the observation of those moral precepts only in which all religions agree (for all forbid us to steal, murder, plunder, or bear false witness), and that we should not intermeddle with the particular dogmas in which all religions differ, and which are totally unconnected with morality.

Health is value greater than studying.