From his “New Nationalism” speech. 1910.
The true friend of property, the true conservative, is he who insists that property shall be the servant and not the master of the commonwealth; who insists that the creature of man’s making shall be the servant and not the master of the man who made it. The citizens of the United States must effectively control the mighty commercial forces which they have called into being.
See also what Lincoln and Obama have to say about true conservatives.