Moses was one of the most humble men and at the same time a vigorous leader. Being humble means knowing your place before God... that you have no purpose in life without Him... that there is no future without him... you are completely dependent on God, the meaning of your existence is to glorify Him.
But, there is another side to humbleness, to know who we are before God. He being our Lord, makes us become giants in the spiritual world (invest in your communion with God). We can do anything through our Lord Jesus!
And perhaps when you're starting something these thoughts may come, "You? Trying to do something big for God? What a waste of time! You're so insignificant!"
But if you understand and are humble to accept that you are nothing without him, I repeat, you can do anything! Being vigorous and humble seem contradictory but, in the Kingdom of God, they go together (hand in hand).
Think: Where is your humbleness when you worry more about your image (in front of men), than doing the work of God?
Let's be humble, with a big vision, vigorous and have a courageous faith. Remember: the point of your existence is to glorify Him.