According to the Theological Dictionary ofthe New Testament, the original Greek word translated "mental-regulating" at Ephesians 6:4 refers to a process that "seeks to correct the mind, to put right what is wrong, to improve the spiritual attitude."
Mental-regulating" also includes formal instruction in God's Word. As with Timothy, such training should begin "from infancy." (2 Timothy 3:15)
"Mental-regulating of Jehovah" means regulating our thinking to conform to Jehovah's will.