Allah says that even if those oceans were ink for the Words of Allah, and all the trees were pens, the pens would be broken and the water of the sea would run dry, and the Words of Allah would remain, for nothing can outlast them. For no one can comprehend the greatness of Allah or praise Him as He deserves to be praised, except the One Who praises Himself. Our Lord is as He says He is and He is beyond what we can say. The blessings of this world, the beginning and end of it, in comparison to the blessings of the Hereafter, are like a mustard seed compared to the entire world.
Ar-Rabi` bin Anas said, “The parable of the knowledge of all of mankind, in comparison to the knowledge of Allah, is that of a drop of water in comparison to all of the oceans.”
[ Taken from the book Tafsir Ibn Kathir ]