There are many directions one can take to answer this question. Yesterday I came across a marvelous teaching of the Netivot Shalom. He frames it in a particular textual peculiarity Genesis 24:1
1. And Abraham was old, advanced in days, and the Lord had blessed Abraham with everything.
The question he raises is why the phrase “advanced in days” is needed. The verse says he was old. Is this not the definition of advanced in days? Basing himself on the traditional understanding that the Torah uses an economy of language, the seemingly needless phrase must teach us something more than just telling us Abraham was old.
He suggests that “advanced in days” is a way of describing how Abraham lived. Each day was lived to the fullest, which for Abraham meant each day was infused with an act of hesed, loving-kindness or compassion. Abraham in Jewish tradition is the exemplar of hesed, the person who opened his tent to wayfarers. The Netivot Shalom says that to live a day without an act of hesed is to uproot the very existence of that day. It is as if that particular day did not happen.
He connects this to a verse in Psalms 89:3 “The world will be built with/through hesed.” (Admittedly this may not be the simple meaning/translation of the verse but it does reflect the Hebrew). He develops this further through the concept articulated in the daily liturgy that God renews creation daily. To renew creation each day means that we must perform each day an act of hesed or loving-kindness/compassion for someone. It is the act of hesed that creates each day anew.
The legacy of Abraham in this teaching is compassion/loving-kindness practiced on a daily basis. This is not to reduce the importance of other commandments or to reduce the complexity of Abraham’s life in any way. Rather it is an expression of the importance of hesed, its creative component, and its accessibility to all. To model Abraham is to be a compassionate human being. To experience God’s hesed is to to practice hesed. The Netivot Shalom also warns us that to act in the opposite manner is to be destructive. Withholding compassion improperly and acting in a negative manner can destroy the day you have lived.