suaviter in modo, fortiter in re (L: suavely in manner, firmly in matter) gentle in manner, resolute in execution.

summum jus, summa injuria (L) The rigor of the law is the height of injustice. (cf. Cicero, De Officiis 1: 10; jus summum saepe summa malitia est)

sunt bona, sunt quaedam mediocria, sunt mala plura (L) Some things (in this book) are good, some middling, but more are bad.　― Martial, Epigrammata 1: 1: 16.