There are many things in my heart, and the world has become smaller. If there is nothing in my heart, there can only be a bed at the widest place. This sentence tells us that we should learn to let go, don't worry about unimportant things and enjoy the beauty of life.

The phrase "the world of mortals is full of troubles, why are you afraid of idle people?" It means that in this busy and lively world, we should bravely face all kinds of troubles and trifles in life, and don't be afraid of idle people and unnecessary things. Because, only after experiencing the hustle and bustle of life can we better understand the true meaning of life.

In a word, this sentence is a famous philosophical saying, telling us to learn to let go of our troubles, enjoy the beauty of life and face the challenges and difficulties in life bravely.