But the main thing, etc.… and if it is missing: meaning, if that thing is lacking, bitachon will not be found; it is that his heart be, etc.

That he will keep what he said: this is in a matter that needs no action, like Lavan’s promise to Yaakov Avinu that whatever the sheep bore speckled and spotted would be his wages. All the sheep were in Yaakov’s hands, and Lavan needed to do nothing but keep his word and not hold it back from him. And of what requires action he said, “and do what he undertook,” which is also a term of promise, as in “If you have become surety for your fellow” (Mishlei 6:1).

And that he will intend good for him, etc.: that he will think about him, to do good for him even in what he did not stipulate, etc., and he will do this as a gift and a kindness. Here too he said, “in what he did not stipulate to him and did not undertake to do,” corresponding to the two kinds mentioned above.