I found it sad that Jacob did not really trust Esau's forgiveness. Jacob said he would follow Esau to Seir, but instead he settled in Shechem - which resulted in disaster.
All sin is wrong, but sexual sin seems to have some of the most disastrous consequences. Dinah's family was righteously angry over Shechem's sin, but they reacted unrighteously. They were right to be angry, but they were wrong to exact revenge the way they did. A huge reminder to us not to let righteous anger turn into unrighteous behaviour.
Jacob showed a disturbingly lack of parenting in this chapter as well. Not only did he do nothing about the disgrace to his daughter, but he was going to passively allow the plan of inter-marrying with the Canaanite.
The sad thing is that if Jacob had obeyed God, none of this would have happened. He wasn't supposed to be near Shechem, he was supposed to be in Bethel.
In Chapter 35 he finally obeys God and goes to Bethel - as he had vowed to do 30 years before, and as he had set out to do when he left Laban 10 years before. Talk about delayed obedience! It seems like the disastrous events of Chapter 34 finally opened up Jacob's ears to hear the call of God. God's purpose is never thwarted by our refusal to obey - but our ability to experience the blessing of God is forfeited when we do so.
Our Romans passage reminds us not to be proud about our salvation, but to continue to work it out with fear and trembling, to remain faithful till the end. He has given us (Gentiles) salvation due to His mercy and grace alone, not based on any of our own merit, and we must not forget that.
Tomorrow's Bible In a Year Passage passage: Genesis 36-38, Romans 12