In jargon, it's easy to get what you want, but it's hard to get what you want. What do you mean?
This is a classic saying in the field of antique coin collection. Shuntian and Deyi are two kinds of coins in Tang Dynasty. Shuntian refers to Shuntian ingots, which are not many in the world, but you can still buy them if you look closely. It's hard to find a gold ingot with one finger, but it's hard to find one. Therefore, it is easy to get down in the sky, but difficult to get down in the sky.