They can be like the sun, words.
They can do for the heart what light can for a field.
Well and good if all things change, O Lord God, provided I am rooted in You.
No matter how much individuals do through their own efforts, they cannot actively purify themselves enough to be disposed in the least degree for the divine union of the perfection of love. God must take over and purge them in that fire that is dark for them, as we will explain.