Use the word profundity in a sentence?

The profundity of the pastor's sermon captivated everyone in the church.

The level of profundity in Martin Luther King's "I Have a Dream" speech is unmatched by any other speech in American history.

The professors' lectures aren't known for their profundity, but the students find them very entertaining.

The quotation is a simple one, but its profundity yields much food for thought.