'Abandon all hope, ye who enter here'

Gustave Doré - Dante Alighieri - Inferno - Plate 8
(Canto III - Abandon all hope ye who enter here).

“Those, then, who want to find themselves at the starting point of a truly free philosophy, have to depart even from God. Here the motto is: whoever wants to preserve it will lose it, and whoever abandons it will find it. Only those have reached the ground in themselves and have become aware of the depths of life, who have at one time abandoned everything and have themselves been abandoned by everything, for whom everything has been lost, and who have found themselves alone, face-to-face with the infinite: a decisive step which Plato compared with death. That which Dante saw written on the door of the inferno must be written in a different sense also at the entrance to philosophy: ‘Abandon all hope, ye who enter here.’ Those who look for true philosophy must be bereft of all hope, all desire, all longing. They must not wish anything, not know anything, must feel completely bare and impoverished, must give everything away in order to gain everything. It is a grim step to take, it is grim to have to depart from the final shore.” 

Friedrich Wilhelm Joseph Schelling - On the Nature of Philosophy as a Science (1821)