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Sometimes the eyes say more than the mouth does.
Literal
Eye [subject-が] mouth [more-than-より] thing [object-を] say time [subject-が] exists.
Aphoristic observation built on the comparative pattern X より Y ('more than X, Y'). Literally 'there are times when the eye says things more than the mouth does.' 時がある ('there are times when') is a fixed frame for hedged generalisations — 'sometimes X happens' — that softens what would otherwise be a universal claim.