The idea of waste only comes into our Christianity when we underestimate the worth of our Lord.
It is highly dangerous to receive the truths of the Bible with human wisdom, for this is a hidden and subtle method which invariably causes a believer to perfect with his flesh the work of the Holy Spirit.
Outside Christ, I am empty; in Christ, I am full.
To keep our hand on the plow while wiping away our tears -- THAT is Christianity!
All knowledge is the outgrowth of obedience; everything else is just information.
Satan can only attack us from the outside in. He may work through the lust and sensations of the body or through the mind and emotion of the soul, for those two belong to the outward man.