Some people are in essence only two-dimensional beings, while others experience life in all three of their God-given dimensions. If you have not yet entered into that third dimension, you don't know what you are missing, literally.
God created you in His image. He is three Persons in One God. You are also three in one: body, soul, and spirit. The apostle Paul wrote, "May God Himself, the God of peace, sanctify you through and through. May your whole spirit, soul and body be kept blameless at the coming of our Lord Jesus Christ." (1 Thess. 5:23) Those three distinct words in English come from three distinct words in the original Greek text. You are one person with three God-given parts.