21 grams is the weight of the soul. It’s said that a person after death will reduce the weight of 21 grams, which is the most pure love. The 21 grams is as follows: one gram is tolerance,one gram is acceptance, one gram is support,one gram is pouring out,one gram is memorable, one gram is  romantic,one gram is the exchange, one gram is to pray for him or her,one gram is apology, one gram is to admit ,one gram is thoughtful, one gram is the thanks ,one gram is the error correction, one gram is a considerate, one gram is an open solution, one gram is not to endure, one gram is not to question, one gram is not to require, one gram is not to forget,the last gram is not to casually hold hands, but it should not let go.