Just as man's physical existence was liberated when he grasped that 'nature, to be commanded, must be obeyed', so his consciousness will be liberated when grasps that nature, to be apprehended, must be obeyed - that the rules of cognition must be derived from the nature of existence and the nature, the identity, of his cognitive faculty.
Ayn RandYour emotional capacity is an empty motor, and your values are the fuel with which your mind fills it. If you choose a mix of contradictions, it will clog your motor, corrode your transmission and wreck you on your first attempt to move with a machine which you, the driver, have corrupted.
Ayn Rand