If the only prayer you said was thank you, that would be enough. - Meister Eckhart

Now rejoice, all ye powers of my soul, that you are so united with God that no one may separate you from Him. I cannot fully praise nor love Him therefore must I die, and cast myself into the divine void, till I rise from non-existence to existence.

This passage from nothingness to real being, this quitting of oneself is a birth accompanied by pain, for by it natural love is excluded. All grief except grief for sin comes from love of the world. In God is neither sorrow, nor grief, nor trouble. Wouldst thou be free from all grief and trouble, abide and walk in God, and to God alone. As long as love of the creature is in us, pain cannot cease.

Truly, if someone were to renounce a kingdom or the whole world while still holding on to themselves, then they would have renounced nothing at all.