It Is Merely a Gift:
The Kli Yakar also writes that the reason for the mitzvah of bikkurim is to remind us that we do not really own the land. The pasuk states: "And it will be when you come to the land that Hashem gave to you..." The land is not ours as an inheritance; rather, it is given to us as a gift from Hashem on condition that we keep his Torah and obey His words.