The Reconciliation of Jacob and Esau (Genesis 33:4)

(4) And Esau ran to him and embraced him, and fell on his neck and kissed him; and they wept.

And embraced him: His compassion was moved when he saw him prostrate himself all those times. (Genesis Rabbah 78:8)

And kissed him: There are dots above the word; there is a difference of opinion about this matter (in a baraita of the Sifré); some explain the dots to mean that he did not kiss him with all his heart [sincerely]; Rabbi Shimon ben Yochai said, "It is a well known tradition that Esau hated Jacob, but his compassion was moved at that moment, and he kissed him with all his heart [sincerely]."

And he ran: When Esau saw that Yaakov had humbled himself so much before him, he forgave all that he had done to him and he was filled with compassion.

And kissed him: The word has a dot above each letter. In Genesis Rabbah, Rabbi Shimon ben Elazar said, "Everywhere you find the dots above each letter of the word, interpret the meaning of the text as it is written....here there are as many dots as there are letters in the word, so we understand that he kissed him with all his heart [sincerely].

Rav Yannai said, " If this is indeed so, why put any dots above the word? Instead, we learn that originally he had intended not to kiss but to bite Yaakov's neck. God made the neck of Yaakov as [hard as] ivory and the teeth of Esau as [soft as] wax.

and they wept: one on account of his neck, and one on account of his teeth.