From chapter 37 of The Life of Teresa of Jesus.

If I were asked which I preferred, to endure all the trials of the world until the end of it, and then receive one slight degree of glory additional, or without any suffering of any kind to enter into glory of a slightly lower degree, I would accept — oh, how willingly! — all those trials for one slight degree of fruition in the contemplation of the greatness of God; for I know that he who understands Him best, loves Him and praises Him best.

I do not mean that I should not be satisfied, and consider myself most blessed, to be in heaven, even if I should be in the lowest place; for as I am one who had that place in hell, it would be a great mercy of our Lord to admit me at all; and may it please His Majesty to bring me thither, and take away His eyes from beholding my grievous sins.

What I mean is this: if it were in my power, even if it cost me everything, and our Lord gave me the grace to endure much affliction, I would not through any fault of mine lose one degree of glory.

Ah, wretched that I am, who by so many faults had forfeited all!