All discipline at the time seems not to be pleasant, but painful; but later it (apodidōsin | ἀποδίδωσιν | pres act ind 3 sg) yields (apodidōsin | ἀποδίδωσιν | pres act ind 3 sg) the peaceful fruit of righteousness to those who have been trained by it.
Reference
Hebrews 12:11
Sequence
39