When you devote yourself to achieving your goal, you will not be bothered by shallow criticism.

Buddhism Day by Day

Wisdom for Modern Life by Daisaku Ikeda
Friday, January 17, 2014:

 

When you devote yourself to achieving your goal, you will not be bothered by shallow criticism. Nothing important can be accomplished if you allow yourself to be swayed by some trifling matter, always looking over your shoulder and wondering what others are saying or thinking. The key to achievement is to move forward along your chosen path with firm determination.