They say that you can’t pour from an empty cup, that’s why you have to take care of yourself.
There’s an old story about an important man who went to a Zen master and asked him to teach him everything he knew. The master poured tea into the man’s cup until it overflowed and spilled all over. The man told the master to stop and asked if he could see that the cup was full. The master replied that the man’s mind was like the teacup — he couldn’t teach him anything if it was full; he was told to come back when his mind was empty.
A tree sheds its leaves in winter so it can start all over in spring.
Sometimes we have to empty ourselves so we can be full again.