The closing couplet of Jacobowski’s 1899 poem — literally ‘do not cry because they are past; smile because they once were.’ The popular English sentence compresses this into one line and drops the poem entirely.
✓Public domain
Free to reuse. Jacobowski died in 1900, so the German poem is public domain everywhere, and the English sentence has no identified author or copyright owner — it first appears anonymously in 1996, and a phrase this short would not attract copyright in the United States in any case. The risk here is the credit line, not the copyright: printing it as ‘— Dr. Seuss’ on merchandise invites a trademark and false-endorsement problem with Dr. Seuss Enterprises, which polices the name vigorously. Credit it honestly instead.
⚠ This reflects the original work, which is public domain. If your exact English wording comes from a specific modern translation, that translation may itself still be under copyright — check the edition you quote.
Rights status is our research, not legal advice — and copyright varies by country and edition. For commercial or published use, confirm with the rightsholder. See terms.