The theme of the poem not marble nor the gilded monuments is?

The theme of the the Sonnet is that the verse of the poet will outlive the marble and gilded monuments as they are prone to the destruction and devastation caused by wars, broils and oblivious enmity, whereas the sonnet is going to make a person survive in the minds of the people and make him eternal and immortal. but poet's sonnet will make him live till the judgement day.