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והיו הדברים האלה וגו׳. לפי׳ הא׳ משמעו רעיון של מס״נ יהא מושרש בלב שהרי אמר שלא יגיע לידי כך לעולם אבל מכ״מ המצוה שיצויר בלב שאם יבא לידו ה״ה מוכן לכך: And these words shall be, etc. According to the first approach (in the comment to the above verse) its meaning is that the idea of self-sacrifice in times of hardship should be rooted in our hearts, because one could say that it will not ever come to that, but even so the commandment is to imagine in his heart that if it came to him he would be prepared for it.