‘Whose roots lay deeper than our lives’— what aspect of human behaviour does this line reflect?

A banyan tree lives through lives and generations. It witnesses people, ages, change, amendments, cultural and physical shifts. It witnesses growth and replantation of civilization. The life span of a banyan tree is usually two hundred long years, expanding through several human generations. The long, knotted aerial roots seem to contain within themselves the knowledge and truth of life. Compared to the eighty years that a man lives, a banyan tree outgrows him to experience generational changes and upheavals. The strange, mystical and enchanting appearance of the tree, with its long old roots that seem to be soaked with old truths, hang rigidly to signify their unperturbed and silent existence since ages. These trees have seen generations to grow and regrow and they have grown old along with time.