Summary
This quote emphasizes the importance of focusing on a single goal or objective rather than getting lost in numerous smaller tasks or pursuits. It suggests that it is more worthwhile and rewarding to fully dedicate oneself to the mastery of one significant challenge or accomplishment, rather than spreading oneself too thin and only skimming the surface of various lesser tasks. By concentrating one's efforts and energy on a single "mountain" - a significant achievement or goal - one can obtain deeper knowledge, expertise, and fulfillment.