[φρήν] probably from an obsolete φράω (to rein in or curb; compare G5420); the midrif (as a partition of the body), i.e. (figuratively and by implication, of sympathy) the feelings (or sensitive nature; by extension (also in the plural) the mind or cognitive faculties)
Usages throughout the bible
1 Corinthians 14:20
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Brethren, be not children in understanding: G5424 howbeit in malice be ye children, but in understanding G5424 be men.