Hebrews 12:11

πᾶσα δὲ παιδεία.… Another encouragement to endure chastening: if it is allowed to do its work righteousness will result. “Now all chastisement for the present indeed seems matter not of joy but of grief, afterwards however it yields, to those who are disciplined by it, the peaceable fruit of righteousness”. [πᾶσα, as Chrys. says, τουτέστι καὶ ἡ ἀνθρωπίνη καὶ ἡ πνευματική.] πρὸς τὸ παρόν, see Thucyd., ii. 22. οὐ δοκεῖ … λύπης, Chrys. καλῶς εἶπεν · οὐ δοκεῖ. οὐδὲ γάρ ἐστι λύπης ἡ παιδεία, ἀλλὰ μόνον δοκεῖ, see Bleek. Chastisement is here viewed as an opportunity for cultivating faith and endurance and to those who use the opportunity and are exercised and trained by it, διʼ αὐτῆς γεγυμνασμένοις, it necessarily yields, renders as the harvest due, ἀποδίδωσιν, as its fruit increased righteousness of life. But why “peaceful” εἰρηνικὸν ? Probably because the result of the conflict (γεγυμνασμένοις) and victory is peace in God and peace of conscience. It is a peace which can only be attained by those who have used their trials as a discipline and have emerged victorious from the conflict.