"AND ESAU RAN... AND HE EMBRACED HIM... AND HE KISSED HIM AND THEY WEPT': IS IT POSSIBLE TO BELIEVE ESAU’S KISS?
"And Esau ran to meet him... and kissed him": Do not read 'and he kissed him' (vayishakehu) but 'and he bit him' (vayinshachehu). (Pirkei Derabi Eliezer XXXVI).
"And he kissed him" - the word has dots above it. Should one suppose that this was a kiss of love? R. Shimon ben Elazar said: But were not all Esau's acts of hate at the beginning? - Except for this one, which was an act of love. (Avot Derabi Natan II)
The word "and they wept" is a sure sign that we have before us pure human emotion. A person may indeed kiss without his heart being in it, but we can rest on the assumption that the tears which burst forth at such moments come from the depths of the heart; this kiss and these tears show us that Esau too was a descendant of Abraham our father, and not just a savage hunter, for how else could he have attained the rank of a ruler in the development of mankind? The sword alone, mere physical force, do not make a person fit for such status. (From the commentary of R. Samson Raphael Hirsch on the Torah)
"And they wept" - Both of them wept. This teaches us that, at that moment, love for Esau stirred in Jacob too. And so it is down the generations: when the descendants of Esau are inspired by a pure spirit to recognize the descendants of Israel and their qualities, then we too are stimulated to recognize Esau, for he is our brother. Thus Rabbi Yehuda Hanassi truly loved the Emperor Antonius - and there are many more such examples.
(From the commentary "Haemek Davar" of R. Naphtali Zvi Yehuda Berlin, Hanatziv from Velozhin)