Think about the 'mountain' as a vision and the 'stone' as goals. In effect, we can understand the proverb as saying, in order to achieve any great vision we must break it down into smart goals. Goals are very crucial to any vision. They transform insurmountable mountains into workable hills. The proverb could also be interpreted as saying, we should not be discouraged by our dreams but rather be determined in our desire. Just take things one step at a time and little by little you will get there, if you don't give up!