What is the main idea of poem if?

In the poem "If", by Rudyard Kipling, the main idea is that individuals possess the power to overcome adversity and achieve greatness through self-discipline, determination, and moral fortitude. The poet encourages the reader to embrace challenges, remain steadfast in their convictions, and maintain self-control, even in the face of fear, doubt, and criticism. The emphasis is on developing inner strength and character, regardless of one's circumstances or the opinions of others. Through this poem, Kipling reminds readers that true success and fulfillment lie in personal growth and the journey of self-mastery.