How can meditation be well understood? Speak in detail, thank you for your answer!

Meditation is to limit the behavior of the physical body to yourself and develop the soul into the human interior. This is very dangerous. If you are completely empty, you may be invaded by evil spirits. Man has three parts: spirit, soul and body. The body is the body of external matter. The soul is your thoughts, emotions and will. Spirit is the core part of human beings, which has three functions: conscience, intuition and communication. Spirit is used to contact God. But if you don't touch the true God properly and meditate within the scope of your soul, you may let evil spirits in, not the Holy Spirit.