People are not poor in ambition.

This sentence means that people can be poor, but they can't lose their pursuit and goals, that is, "ambition." Even if the economic conditions are not good, people should keep their dignity and ambition, and don't give up their pursuit because of poverty. On the contrary, if a person has no ambition, then he loses the direction and motivation to move forward, just like a ship without a rudder, and can't reach its destination.

This sentence means to encourage people not to be limited by material conditions, but to pursue higher goals and ideals. Even in a difficult environment, people should keep their faith and determination, continue to work hard and finally realize their dreams.