Like air

All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work. (2 Timothy 3:16, 17 ESV)

I often think of God's word like air, we breathe it in, it nourishes us, and then we in turn breathe it out along with impurities that it has cleaned out, just like when we exhale toxins are expelled from the body.  We need The nourishment that His word provides, and the cleansing it provides from the inside out.