Abraham and his offspring received the promise that he would be heir of the world, but through the righteousness that comes by faith

 Romans 4:13-16

It was not through the law that Abraham and his offspring received the promise that he would be heir of the world, but through the righteousness that comes by faith. For if those who depend on the law are heirs, faith means nothing and the promise is worthless because the law brings wrath. And where there is no law there is no transgression. Therefore, the promise comes by faith, so that it may be by grace and may be guaranteed to all Abraham’s offspring—not only to those who are of the law but also to those who have the faith of Abraham. He is the father of us all.

Why?

Because the law brings wrath, and where there is no law there is no transgression. The promise comes by faith. No one can be righteous through the law, no one can obey the laws fully in the world.

The promise comes by faith, which is to believe what God's way is the best way to us, God's word is our strength, internal a man have to be humble and submit to Jesus Christ. 

Not only believe in Jesus but his behavior is based on the loves of Christ. This is a very difficult target.

What we have to fight is our pride, our selfishness, our desire, and our narrow mind.

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神與亞伯拉罕和他的後裔立約，賜土地與產業。神先有應許，亞伯拉罕先相信，才可以得到。這不是血統的後裔而是因為信得到應許。

因為律法是叫人受刑罰的，不能帶給人恩典，赦免的。一切都是神已經安排好，人只要相信，去行，不要自己找出路。

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How?

We are nothing without the Lord and Jesus Christ.