He knows your most secret needs and wishes, your thoughts and actions. He is forbearing in the punishment of the guilty. He is in need of nothing. We cannot understand His greatness nor imagine it. If He didn't hide our faults, adverse opinions, ugly thoughts and hateful feelings, everyone would run away from everyone else.
Thankfulness is to return good with good.
The thankful one knows that all he is and all he has is from Allah. Nothing is like Him. There is no difference for Him between the creation of an atom and the infinite-seeming universe. In His preservation, there is also protection. As a blessing He sent His prophets and books to teach wisdom, intelligence, the divine law to protect man from material and spiritual harm.