'Reason' in the Bible

I have turned round, also my heart, to know and to search, and to seek out wisdom, and reason, and to know the wrong of folly, and of foolishness the madness.

See, this I have found, said the Preacher, one to one, to find out the reason

Dead flies cause a perfumer's perfume To send forth a stink; The precious by reason of wisdom -- By reason of honour -- a little folly!