Life […] is really a constant suffering, or, at any rate, […] a business that does not cover the costs.

[Da das Leben […] eigentlich ein stetes Leiden, oder wenigstens, […] ein Geschäft ist, welches die Kosten nicht deckt.]

Arthur Schopenhauer (1788-1860) German philosopher

Die Welt als Wille und Vorstellung [The World as Will and Representation], Vol. 2, ch. 19 “Vom Primat des Willens im Selbstbewußtseyn [On the primacy of the Will in Self-Consciousness],” § 11 (1844 ed.) [tr. Payne (1958)]
    (Source)

(Source (German)). Usually paraphrased: "Life is a business that does not cover the costs."