Water isn't free; someone is paying a bill to purify the water that comes through that fountain.
Then change it, purify thyself; and as thou art purified, thou wilt gain wisdom.
They are then pressed in a large powerful screw-press, and the oily matter which flows out is caught, mixed with an equal proportion of water, and boiled to purify it from mucilaginous and albuminous matter.
Incidentally he desires also to purify the heart from other violent passions which corrupt it and mar its peace.
He was weary of the rabies theologorum, and dreamed that the evangelical leaven, if tolerated, would purify the church's life and doctrine.