NET
11 Now all discipline seems painful at the time, not joyful. But later it produces the fruit of peace and righteousness for those trained by it.
Darby
11 But no chastening at the time seems to be [matter] of joy, but of grief; but afterwards yields [the] peaceful fruit of righteousness to those exercised by it.
KJV
11 Now no chastening for the present seemeth to be joyous, but grievous: nevertheless afterward it yieldeth the peaceable fruit of righteousness unto them which are exercised thereby.