While the main drama of our parasha is the story of Jacob and Esau, there is a secondary story about the wells that the Philistines kept sabotaging. The wells were a blessing for everyone, as "a rising tide lifts all boats," so why did the Philistines sabotage them? The Torah tells us: Isaac had possessions of flocks and of herds and many slaves, and the Philistines envied him. And all the wells that his father's servants had dug…the Philistines blocked up…In other words, it was jealousy that led them to block up the wells. When we become jealous of someone else's good fortune, we lose perspective and only end up hurting ourselves.