Luke 6:46-49

This is why it is so important to raise children in church.  Children need a godly upbringing so that their roots are planted.  All children rebel at some time in their lives yet God always brings them to a low point where they have no choice but to choose to continue or choose something better, Him.  If they already have that foundation in Christ, then they have Him to pick them up; if they don't, when those trials come, they are more likely to keep a downward journey throughout their lives.