Pro 3:1 My son, forget not my law; but let thine heart keep my commandments: (KJV)
We “keep” (5341) God’s “commandments” (4687) in our hearts or we don’t keep them at all. Obedience cannot be a matter of following rules and checklists, it is a part of regeneration. The law was always available as an outward code, but the promises of the prophets had to do with it being written on our hearts. The opposite is what Paul would call “eye-service”.