People cannot extend the length of life, but they can expand the width of life. Tell us your understanding of this sentence

The original sentence is: You can't extend the length of life, but you can expand its width; you can't control the direction of the wind, but you can change the direction of the sail; you can't change the weather, but you can control your mood ;You can't control the environment, but you can adjust your mentality.

Meaning: A positive attitude will bring positive results. By maintaining a positive attitude, you can control the environment, otherwise the environment will control you. If you want to have a positive attitude, you must learn to think positively. Human vision and thinking have blind spots. When you see the negative side, you cannot see the positive side. We need to adjust it to a positive position like a knob on a radio. Frequent reading and positive psychological suggestions will be beneficial to you. Having a positive attitude will help us eliminate fear and inferiority complex. Associating yourself with positive people, you will be like a piece of coal blending into a coal stove. Those who are close to vermilion will be red, and those who are close to ink will be black. People are divided into groups, and birds of a feather flock together.