How does Recessional convey humility in leadership?

Hi everyone,
I’m analyzing Recessional by Rudyard Kipling for my Literature class, and I’m struggling to understand how the poem addresses leadership. From what I gather, Kipling seems to be emphasizing humility and the need for divine guidance in times of power. How do the lines “Lest we forget” and references to “humble and contrite heart” convey this message of humility? I’d really appreciate any help in breaking down these themes for my essay!