One person has the skill to hammer brass into the most exquisite shapes and to engrave elaborate patterns on to it.
Another has the skill to make furniture, joining together different pieces of wood so firmly that no one can break them apart. A third person can spin the finest yarn, while a fourth weaves it into cloth.
A fifth craftsperson can lay stones one on top of the other to build walls, while a sixth puts a roof on top of the walls to make a house. Indeed there are so many different skills, each one requiring many years to attain, that it would be impossible to list them all.
So what is the skill that rich people should acquire? They do not need to fashion brass or wood, or to build houses. Rather, they must learn how to use their wealth well, to the good of all the people around them. The ordinary craftsperson may think that that is an easy skill to learn. On the contrary, it is the hardest skill of all. It requires both great wisdom and great moral strength. Look at how many rich people fail to acquire it, and how few practice it to perfection.