Poetry is adolescence fermented, and thus preserved.
— Jose Ortega y Gasset

It is not all bad, this getting old, ripening. After the fruit has got its growth it should juice up and mellow. God forbid I should live long enough to ferment and rot and fall to the ground in a squash.
Emily Carr fermented quote

Unquiet souls. In the dark fermentation of earth, in the never idle workshop of nature, in the eternal movement, yea shall find yourselves again.
— Matthew Arnold

The imagination of a boy is healthy, and the mature imagination of a man is healthy; but there is a space of life between, in which the soul is in ferment, the character undecided, the way of life uncertain, the ambition thick-sighted: thence proceeds mawkishness.
— John Keats

Leisure time should be an occasion for deep purpose to throb and for ideas to ferment. Where a man allows leisure to slip without some creative use, he has forfeited a bit of happiness.
— fermented quotation by C. Neil Strait