The result may be expressed either as the invalidity of such operations of mind as he could provide for in his universe, or the Irreducibility to his chosen first principles of the very thought which defined them.
"The Approach to Philosophy"
Ralph Barton Perry
To get a notion of this Irreducibility and irreversibility, we must break with scientific habits which are adapted to the fundamental requirements of thought, we must do violence to the mind, go counter to the natural bent of the intellect.
"Creative Evolution"
Henri Bergson