ἀρκετὸν τῇ ἡμέρᾳ ἡ κακία αὐτῆς → sufficient unto the day is the evil thereof, each day has enough trouble of its own, there is no need to add to the troubles each day brings (Matthew 6:34)
subs.
P. and V. παρρησία, ἡ, P. ἀπλότης, ἡ (Xen.).