Thomas Brooks emphasizes that God is the ultimate portion for every believer, surpassing all earthly riches, honors, and successes. He explains that while creatures possess individual excellencies, God embodies the fullness of all goodness, wisdom, and beauty. The sermon highlights that believers have access to the entirety of God, who is their eternal possession, providing them with profound joy and comfort. Brooks encourages believers to recognize the immense value of having God as their portion, which far exceeds any material wealth or accolades. Ultimately, he reassures that this God, who is the universal good, is forever theirs.