In the poem IF by Rudyard Kipling, the poet says:
If you can trust yourself when all men doubt you
Why is it so important to trust oneself?
Self-belief is the thing that can lead one to the path of success. If one does not trust oneself, one cannot find inspiration and know one’s strengths. That will lead to failure in the journey of life. Keeping faith in ourselves ensure that we don’t get demoralized or disheartened facing initial hurdles on the way. So, the poet has urged us to trust ourselves even when others doubt us, provided that we haven’t done any wrong.