Try to become as great as you can. Some people are afraid to accomplish because they might make mistakes — and those mistakes will be more serious than if they remained simple!
This is not valid reasoning. Each person is obligated to develop himself to the best of his ability. The smallest person has potential for greatness if he utilizes all that is within him.
Sources: Rabbi Yosef Leib Bloch – Shiurai Daas, vol.3, p.130; Rabbi Zelig Pliskin’s Gateway to Happiness, p.131