Jesus’ clear certainty about the Resurrection is based entirely on the fidelity of God, Who is the God of life. In fact, behind the question of the Sadducees lies a deeper question: not only whose wife the widow of the seven husbands will be, but whose will her life be. It is a doubt that touches the man of all times and also us: after this earthly pilgrimage, what will become of our lives? Will it belong to nothing, to death?
Jesus answers that life belongs to God, Who loves us and cares so much about us, to the point of linking His name to ours: He is “the God of Abraham and the God of Isaac and the God of Jacob. Now He is not God of the dead, but of the living, for all live to him”. (vv. 37-38). Life exists where there is bond, communion and brotherhood; and it is a stronger life than death when it is built on true relationships and bonds of fidelity. On the contrary, there is no life where one has the pretension of belonging only to oneself and of living as an island: in these attitudes death prevails. It is selfishness. If I live for myself, I am sowing death in my heart.
Read full version of The Pope’s words at the Angelus prayer, 10.11.2019; https://press.vatican.va/content/salastampa/en/bollettino/pubblico/2019/11/10/191110a.html