The next time you throw your hands up and say "life is not fair," this is what God explained to Moses: life is not fair. He decides who gets his grace for reasons that are His alone.

Exodus 33:19

Then He said, “I will make all My goodness pass before you, and I will proclaim the name of the Lord before you. I will be gracious to whom I will be gracious, and I will have compassion on whom I will have compassion.”
Bible Gateway pasage: Exodus 33:19 (NKJV)