Thomas Brooks emphasizes the transient nature of earthly glory, comparing it to flowers that quickly wither and fade. He reflects on the historical rise and fall of great kingdoms, illustrating that all worldly inheritances ultimately lose their splendor. In contrast, he highlights the eternal and unchanging glory of the heavenly inheritance promised to believers, which remains vibrant and everlasting. Brooks encourages his listeners to seek this incorruptible inheritance, reminding them of the joy and security it brings. The sermon serves as a powerful reminder of the fleeting nature of worldly achievements compared to the lasting glory found in God.