Why can't we do things right away? Some people can do two things at the same time. Why?
Everyone can use two things at the same time. People can't use two things at the same time. If we separate them, we think they are two different things. If they treat two things as one thing, they can use two things at a time, that is, "one for all things, all things are one" and "one for many, many for one" as Buddhism says.