Proverbs 23:12 Apply thine heart unto instruction, and thine ears to the words of knowledge.
13 Withhold not correction from the child: for if thou beatest him with the rod, he shall not die.
14 Thou shalt beat him with the rod, and shalt deliver his soul from hell.
These verses begin by telling us that we need to get as knowledge and understanding of the word of God and apply it from our heart. With that we see we are not to withhold correction from our children even if it means spanking them. As the scripture says it will not kill them to get spanked for doing wrong. The last verse lets us know that by doing this we helping to save our children from the pits of Hell. If they are disciplined when they young you run the risk of them being bad people when they grow up. Discipline is part of the knowledge they gain when they are young.