The only true basis for morality is recognizing that other beings suffer from the same "Will" as you.
Called Schopenhauer his "great teacher," though he later rejected Schopenhauer’s "denial of life." Schopenhauer-Handbuch: Leben — Werk — Wirkung
His doctoral dissertation which established the logical groundwork for his system, focusing on how we perceive the world through reason and cause-and-effect. The only true basis for morality is recognizing
The collection of essays and aphorisms that finally made him a household name, containing his witty (and often cynical) advice on life. Philosophy & Psychology: Philosophy & Psychology: Because the "Will" is never
Because the "Will" is never satisfied, life is inherently suffering.
Spent his final decades in relative isolation in Frankfurt with a succession of poodles (all named Atman), where he finally achieved fame late in life. II. Work (Werk): The World as Will and Representation