• Consider this fact also. Those who have never attained their mental independence begin, in the first place, by following the leader in cases where everyone has deserted the leader; then, in the second place, they follow him in matters where the truth is still being investigated. However, the truth will never be discovered if we rest contented with discoveries already made. Besides, he who follows another not only discovers nothing but is not even investigating. • What then? Shall I not follow in the footsteps of my predecessors? I shall indeed use the old road, but if I find one that makes a shorter cut and is smoother to travel, I shall open the new road. Men who have made these discoveries before us are not our masters, but our guides. Truth lies open for all; it has not yet been monopolized. And there is plenty of it left even for posterity to discover. Farewell.