Meaning of “Each day acquire something that will fortify you…”

Meditations, Book VII, section 61, George Long translation; the full sentence emphasizes readiness for sudden and unexpected onsets.

Letter 76, on learning wisdom in old age, cites the proverb while defending continued philosophical study.

Act 5, Scene 2.

As You Like It, Act II, Scene 1, Duke Senior; 1919 Yale Shakespeare edition edited by Jack R. Crawford, printed page 24 / Wikisource scan leaf 36. “Sweet are the uses of adversity” occurs in Duke Senior’s Forest of Arden reflection on exile, winter and the lessons he claims to find outside court life. It remains fictional dramatic speech rather than Shakespeare’s autobiographical advice or a modern psychological claim about hardship.

Self-Help, Chapter XI, “Self-Culture—Facilities and Difficulties,” Project Gutenberg #935. The passage follows Charles James Fox’s contrast between early success and perseverance after failure, then leads into examples of discoveries and learning produced through mistakes and failed attempts.

Proverbs 6:6 in the King James Version; the following verses describe the ant preparing food without an overseer.