וְיִצְחָק וגו' מִּבּוֹא בְּאֵר לַחַי רֹאִי וְהוּא יוֹשֵׁב בְּאֶרֶץ הַנֶּגֶב (כד, סב)
And Yitzchok…coming from Be’er Lachai Ro’i, and he dwelt in the land of the south. (24:62)
Rav Henoch of Alexander zy”a (Sefer Chashbah L’Tova) explains this pasuk by saying that it is known that a person who recognizes that Hashem is always overseeing whatever he does will naturally be happy.
Thus, the pasuk is saying: “V’Yitzchok bah.” Happiness comes to a person. (The word “Yitzchok” represents happiness and laughter as is seen from Bereishis 21:6.) Where does this happiness come from? From “Be’er Lachai Ro’i.” A person attains this joy when he recognizes that Hashem is watching him. (The word “ro’i” indicates “watching”.) Even if a person “dwell in the land of the negev”, i.e., a dry and desolate place, and he possesses nothing, Hashem is still always overseeing him. When one knows this, he will be happy.