GEN1133 Zeal is a great virtue that promotes Torah and mitzvos and also worldly progress.   It is a trait of the righteous.   By acting with zeal the righteous arrive at Divine serve.  Our Sages of blessed memory have said Pesachim 4a: “The zealous advance themselves towards the doing of mitzvos.” This can be seen in the case of our father Avraham in the incident of the binding of Yitzchak, as it is written [this verse].   Even though it was understandably difficult for him to slaughter his only son, he did the will of the Exalted Creator with zeal, rising early in the morning.   … When a man frees his heart of all other thoughts that reside in it and seizes upon one thought, then he will undoubtedly be zealous in its execution.   This is what Avraham did. He removed from his heart the love of his son and held on to the will of his Creator, and he negated the love of his son before the love of the will of his Blessed Creator.  … It is for this reason that the Holy One Blessed be He swore to Avraham to remember for his seed the binding of Yitzchak.   TZADIK 283