Musar zu Ijow 15:14

This is what Eliphaz said to Iyov: "What is man that he would be pure, and that one born of woman should be found righteous? Lo! He does not believe in His holy ones, and the heavens are not pure in His eyes" (Iyov 15:14-15), and "Behold, in His servants he puts no trust, and his angels he charges with error; how much more those who dwell in houses of clay, whose foundation is in the dust, who are crushed before the worm" (ibid 18:19). Therefore, behold, certainly every human being should always fear and quake, as Elihu said: "At this also my heart quakes and leaps out from its place; Hear attentively the thunder of His voice and the rumbling that emanates from His mouth" (Iyov 37:1-2).

This is what our sages said: "Know what is above you: an eye that sees, an ear that hears, and all your deeds are inscribed in a book" (Avot 2:1). For since the Holy One, blessed be He, watches over every thing, and He sees everything and hears everything, certainly every action will leave an impression. And all of them are inscribed in a book, whether for merit or for debt (punishment).

This is what the Holy One, blessed be He, commanded the king: "And the Torah shall be with him, and he shall read it all the days of his life, so that he will learn to fear the L-rd, his G-d" (Devarim 17:19). This teaches that the fear is only learned by uninterrupted study.