Our parsha gives us insight into the world of Yitzchak, the unblemished burnt offering (from the akeida) and shows us the differences between each of our forefathers.
Just like his father, Yitzchak plans to move to Egypt due to a famine in Canaan, but God stops him saying
Do not go downto Egypt , stay in the Land I have told you about.
As Rashi explains
שאתה עולה תמימה ואין חוצה לארץ כדאי לך.
As you are an unblemished burnt offering, it is not fitting for you to go abroad.
So Yitzchak stays in the Land, and settles in Gerar. The Torah tells us of the disproportional and seemingly illogical bracha he receives
And the man grew more and more until his was very great
We have seen God's blessing given to our other forefathers, but with a rationale behind them. Avraham had no choice but to go down to Egypt due to the famine, but he returned with many possessions. There is a rational basis to his enrichment. Yaakov too escapes Eisav and leaves Penniless, and after then the bracha appears seemingly naturally.