The writer reminds us that “all discipline for the moment seems not to be joyful, but sorrowful; yet to those who have been trained by it, afterwards it yields the peaceful fruit of righteousness”. Isaiah 32:17 says, “and the work of righteousness will be peace”. Thus the promise that discipline brings righteousness which brings peace. Maybe a practical way to think of this can be seen in Psalm 16 verses 8,9. Discipline allows us to “set the Lord continually before me” and “because He is at my right hand I will not be shaken, therefore my heart is glad and my glory rejoices; my flesh will also dwell securely”.