Comentario sobre Salmos 27:1

To David...In this psalm it will be explained that Hashgacha results from cleaving to Hashem, and the one who cleaves to Him will have Constant Hashgacha which will protect him from all harm, and therefore the individual could rest assured and not fear from any evil thing, for "nothing evil befalls a tzadik", except at the moment he severs the thread of dvekut and turns away from the service of Hashem, as the Moreh Nevuchim expained (3:53). Therefore from the multitude of requests which a man can make, it is fitting that he focus on the single request in which he will find all that he desires; that is [to request] that he cleaves to Hashem constantly. Therefore [David] prays that Hashem assists him in achieving this dvekut and removes all obstacles that prevent this great thing which is the pinnacle of his happiness and his request.

Hashem is my light ... Yirah is from a known thing, and Pachad is from something unknown. When a man fears from revealed enemies which battle with him it is called Yirah; corresponding to this David says that Hashem is my light and my salvation, from whom shall I have Yirah. Meaning to say, it's conceivable that a man will fear from his enemies 1) lest they come upon him at night while he is unable to see them and protect himself; to this David said "Hashem is my light" 2) lest the enemy's might and strength be greater than his [and they overpower him]; to this David said "Hashem is my salvation", and therefore from whom shall I have fear? And regarding man fearing his foes that secretly plot evil against him...without him knowing, this is called Pahad. To this David said that "Hashem is the stronghold of my life" therefore "From whom shall I have pahad?"