Cherubim

"Streams of Wisdom" == 'abundance of knowledge or an outflowing of wisdom' [1]

Of the highest angelic class, caretakers of god's throne. Sentient but too divine and knowledgeable for a human soul and even most of the angels to communicate with. They can speak to others if they so choose but don't have much of a personality due to their enamorment with God.

Purification of Souls: Power of knowing and beholding God, the highest knowing of Divine Wisdom (below God). Responsible for enlightenment & illumination of flaws to be cleansed by the Thrones. parent: Holy Angels

[1] The Celestial Hierarchies [ref]