Atomic Habits by James Clear is an incredible book about how to grow and become the person that you want to be. It is a general purpose book that can be applied to anything; but the real power comes from using Atomic Habits to grow spiritually and intentionally develop great faith.
God has many names in the Bible. We never see Him explicitly called "The God who Multiplies" but we do see this in His character and the call He places in His followers in bearing fruit.
Faith allows us to see things that are eyes cannot see. It gives us vision to see the future we hope for and things that are invisible. With faith we have confidence to face uncertainty knowing that God will provide for our needs when our own power is not sufficient.
Paul wrote it in prison, and the four verses before it are about contentment, not achievement. What Philippians 4:13 means when you read the whole passage.