The small jars

Why was Yaakov left alone on the night he wrestled with the angel? The Gemara, quoted by Rashi, says he had gone back across the river for some small jars that had been left behind. From here Chazal learn that tzaddikim value their possessions, because they never stretch out a hand to take what is not theirs. Every coin they own was earned honestly, and so even something small is precious to them. It was in that moment, alone in the dark over something small, that Eisav's angel came against him and wrestled with him until dawn. Yaakov could not be overcome, and he came away with the name Yisroel.