God gave me to see clearly the truth of the most Holy Trinity. It is just as learned theologians told me, but I did not understand it as I do now... What I have seen is this: three distinct Persons, each one visible and who speaks and to whom we can speak. Afterwards I thought how the Son alone took human flesh, which shows clearly that the three Persons are distinct. The Persons love each other, communicate and know each other. But, if each one is distinct, how can we say that the three are one essence? For this is what we believe. This is deepest truth, and I would die for it a thousand times. In these three Persons there is but one will and one power and one might; neither can one be without the others. There is one sole Creator of all created things. Could the Son create an ant without the Father? No, because their power is one. The same is to be said of the Holy Spirit.
Thus, there is one God Almighty, and the three Persons are one majesty. Is it possible to love the Father without loving the Son and the Holy Spirit? No, for those who please one of the three Persons please all three Persons, and those who offend one offend all. Can the Father exist without the Son and without the Holy Spirit? No, for they are one in being, and where one is, there are the three; they cannot be divided.
How is it, then, that we see that the three Persons are distinct? And how is it that the Son, not the Father, nor the Holy Spirit, took human flesh? This is what I have never understood; theologians know it. What I know is that the three were there when that marvellous work was done. I do not busy myself with much thinking about this; all my thinking comes down to this: God is almighty, that he has done what he would do, and can do what he wills. The less I understand it, the more I believe it, and the greater the devotion it excites in me. May he be blessed for ever! Amen. St Teresa of Avila, Relations.