I'm taking a class this summer on the Blessed Trinity. I shared that with a priest in an interview a few weeks ago. I recently signed contract and will be teaching there in the fall.
The priest leaned back in his seat and chuckled. "Well don't come back to us saying that you've figured out the Trinity!"
I laughed. I knew where the priest was coming from. The Trinity is a mystery. And with all of the mysteries of God, we study, we ponder, we get it in dribs and drabs, and then we sit back and marvel at the mystery that remains mysterious. And we are filled with a desire to study and ponder even more - though, ironically, we realize with more certainty that we will never fully understand.
There is a story about St. Augustine and the Trinity. It's worth retelling.