Etymology suggests that humble as a word traces back to "lowly" as in literally "on the ground" (the same origin as the word humus), so it may have begun as an explicit statement of how materials like sand and salt are literally "of the earth"
@ingrid new sense of "humble bundle" just dropped.
@ingrid “humilis” is also a Latin word for a “low” rhetorical style, associated with the homily (itself also sometimes called in English a humble) — so “the humble mustard seed” might also be taken to mean something like “the proverbial mustard seed”
@ingrid this sense of “sermo humilis” is usually attributed to Cicero, but St Augustine and the church fathers went nuts with it https://www.oxfordreference.com/display/10.1093/acref/9780198662778.001.0001/acref-9780198662778-e-4305
IMO sand is NOT humble though, have you ever been to a beach sand loves to get into EVERYONE'S business and also clothes