The constitution controls any legislative act repugnant to it.

The Constitution is colorblind, and neither knows nor tolerates classes among citizens

We must never forget that it is a constitution we are expounding

An unlimited power to tax involves, necessarily, a power to destroy; because there is a limit beyond which no institution and no property can bear taxation.

The Constitution is not a panacea for every blot upon the public welfare, nor should this Court, ordained as a judicial body, be thought of as a general haven for reform movements.

The constitution is either a superior paramount law, unchangeable by ordinary means, or it is on a level with ordinary legislative acts, alterable when the legislature shall please to alter it. It is emphatically the province and duty of the judicial department to say what the law is. This is the very essence of judicial duty.