Gen. 26:5-6 "I will do this because Abraham listened to me and obeyed all my requirements, commands, regulations, and laws." So Isaac stayed in Gerar.
A severe famine had struck the land and Isaac had given thought to going to Egypt with his family. God paid Isaac a visit and told him not to do it. He reminded Isaac of His promise to bless his father, Abraham, in the land and multiply his descendants there. His promise was that through Abraham's descendants all the nations of the earth would be blessed.
Abraham was promised such a huge blessing because he listened to God and obeyed Him. He didn't just obey Him, he obeyed all of God's requirements, commands, regulations, and laws. In other words, Abraham put his feet where his mouth was. He didn't just believe in God's laws, he lived them. He did his best to walk the walk of his talk. He took God and His ways seriously and as a result God kept His word to Abraham through his son, Isaac.
Imagine what could happen if we were to live like Abraham lived. God blesses those who take Him and His Word seriously. He honors those who honor Him. One of the things that most people struggle with is taking God seriously enough. I don't believe there is enough effort put into trying to live by God's standards. We don't think holiness is that big of a deal. We want just enough of a relationship with God to get by. We don't want all that God has for us or want to do all that He requires of us.
Is it any wonder why there is such shallowness in most who profess to be Christians? Don't be like most. Come out from among them and be like Abraham. Obey all the requirements, commands, regulations, and laws of God to the best of your ability and see what the Lord will do for you.