According to his what? …belief? faith? trust? knowledge? understanding? feelings?

No.

According to his deeds.

The reward of the Master is based on our deeds not our belief.

Did you believe? Good. But did you do what you believe?

That is the difference between faith and emuna.
And what the Master’s brother Jacob (James) was trying to say to us later on in his letter to the tribes of Israel.

Believing without doing is death.
You believe? Good. Now do the deeds in accordance with that belief.

Question Everything