This problem should be understood from two opposing concepts, one is "poverty" and "achievement", and the other is "independence" and "helping the world". If you can understand these two concepts, then this sentence is easy to understand.
The first group: "poverty" and "success" are not poverty and wealth, but success or failure. For example, you are very motivated, but the company has always ignored you, and you are very dissatisfied with your current situation, which is unsuccessful. But you have a good friend, a good buddy. He works and receives the same treatment as you. He is satisfied with himself and doesn't want to pursue a higher position. Although you are the same, you are "poor" and he is "big".
You must be thinking, logically, I should be immune to poverty; However, my friend has reached the limit, but he is not as good as me, and he has never thought about "saving the world", not to mention his low position. How can he "save the world"?
Yes, although your friend is "great", he can't "help the world" Because his level of "reaching" is too low to help the world at all, this is the second meaning of "not reaching".