This Talmudic statement is usually understood as giving a reason for humility. People who might be carried away by vanity should reflect on their humble beginnings and thereby stop any self-aggrandizement.
A scientist who studied the growth and development of the human being remarked, "As I stared through the microscope at the single-cell fertilized ovum, and I realized that this infinitesimally tiny bit of matter could compose the masterpieces of Beethoven and Michelangelo, I was momentarily breathless, overcome with awe. Except for the nutrients it would receive, nothing would be added to this single cell. It is absurd that it has within itself the potential to achieve such greatness. Neither the cell nor its nutrients, nor both together even in the most sophisticated of combinations, could make such a quantum leap, and the only logical conclusion is that some external power instills this intelligence within this bit of protoplasm. It was at that moment that I came to know God."