Parallel
Proverbs 27:1
Swete's Septuagint · Berean Standard Bible
μὴ καυχῶ τὰ εἰς αὔριον, οὐ γὰρ γινώσκεις τί τέξεται ἡ ἐπιοῦσα.
Do not boast about tomorrow, for you do not know what a day may bring.