Augustine of Hippo
The statement that words alone cannot instruct a servant (Proverbs 29:19) does not imply that we should reject discipline; rather, it suggests the means by which correction can be effectively delivered. If it were otherwise, Scripture would have stated, "words will not teach him," instead of "he will not learn." Furthermore, it is affirmed that both the unruly servant and the rebellious son require discipline through correction for their own benefit. As it is written, "You will punish him with a rod, and you will save his soul from the underworld" (Proverbs 23:14). Additionally, it is noted, "He that spares his rod hates his son" (Proverbs 13:25).