What does thoreau mean by saying that he must not purse his own interests while sitting upon another mans shouldersi must get off him first?

Thoreau is emphasizing the importance of independence and self-reliance. By stating that he must get off another man's shoulders first before pursuing his interests, he is highlighting the need to not rely on others for personal growth and development. Thoreau believes that true fulfillment comes from self-discovery and self-reliance rather than depending on others for support or guidance.