Covenant Instruction is not only important for the young, but for people of all ages and stages of life as well. Only when we know our doctrine are we able to live a life which is pleasing to God. Only when we are deeply rooted in Christ are we able to withstand the wiles of the devil.
Eph 4:14 - That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive;