What does it mean to thank God for giving me the best gift?

This means that a person should be grateful and know how to express gratitude when getting benefits, so as to get good returns continuously. Everything in the world has a causal relationship, and what kind of result he will get when he does one thing. God is everywhere, looking at everyone with his fair and just eyes. Good is rewarded with good, and evil with evil. It's not that the time has not come.