To be prepared for the coming conflict, we have only to preach the gospel, and to live the gospel; and also to take care that we teach the children the Word of the Lord. This last is specially to be attended to, for it is by the mouth of babes and sucklings that God will still the enemy.

…

Preach Christ; preach the Word in season and out of season: and teach the children. One of God’s chief methods for preserving His fields from tares, is to sow them early with wheat.

~Charles Spurgeon