From "The Lord my Portion" by Watchman Nee I will put my laws into their mind, and on their heart also will I write them. Hebrews 8.10. Here lies the difference between the New Covenant and the Old. In the Old Covenant the law was placed outside of men, having been written on tables of stone; in the New Covenant it is put into our mind and written on our heart. What is outside and written on tables of stone must be of the letter (2 Cor. 3.6). What, then, is the law which can be put within us and written on our heart? What is the nature of this law? From the word of God we find that the law which can be put into our mind and written on our heart is not of the letter but of life. Each law may not be of life, but every life has its law. The law which God puts in us is the life which He gives us, even "the law of the Spirit of life in Christ Jesus" (Rom.8.2).