Concerning the death of Avraham the Torah says he died at an old age: וְשָׂבֵעַ, “and content”. (Gen. 25,8) What does it mean by saying Avraham was content?
The Ramban gives a very enlightening explanation on this verse. He says that most people are not satisfied with what they have. He quotes the words of Kohelet: אֹהֵב כֶּסֶף לֹא יִשְׂבַּע כֶּסֶף, “he that has silver will not be satisfied with silver…”. (Kohelet 5,9) Or as the saying goes, “He who has one hundred, desires two hundred.” Avraham, on the other hand, was satisfied with what he had.
Ben Zoma tell us in the Mishnah: איזהו עשיר השמח בחלקו, “Who is rich? He who is happy with his lot”.(Avot 4,1)
Many Sages in the Talmud were very poor and yet they managed to continue with their studies and did not complain about their fate. They were happy with what they had.
This is an important message to teach us how a person should live. One should strive to do his best to earn whatever he wants. However, he must be satisfied with what he actually has. If he is not satisfied and does not appreciate what Hashem gives him, he will never be happy