Any human innovations to teaching or worship take away strength. God speaks by Christ. The commands of Christ are oracles from on high. When a congregation builds on hearing and doing the word, they are building on a rock and their house will never fall. We are to be careful to be doers of the word and not hearers only.
Understanding enlightens the soul.
Any church without a strong program of teaching the Bible will be weak. Any church where a segment feels that they must keep the works of the church a secret from membership will be in trouble before long. People need to know the word of God. People need to know of the works the church is doing. Informed people are happy in the Lord while uninformed people are dissatisfied.