A diamond does not become a diamond without a huge amount of pressure and heat that is created by the earth. Similarly, your process of coming home to Him is not without "pressure" and "heat". There are times on this journey when we are releasing false beliefs, and these times can feel very hard. Even after the diamond is formed, it is still rough. This is when the polishing takes place, and a tremendous amount of friction is needed for that. So that you can be made into a perfect clarity and brilliant diamond which reflects Light in an infinite fashion, you too must be polished. This polishing is done by other rough diamonds, often someone you are close to. As they polish you, you polish them through the friction of your relationship.