Midrasch zu Dewarim 8:6

And God appeared unto Jacob. Scripture states elsewhere in allusion to this verse: All the paths of the Lord are mercy and truth (Ps. 25:10). When Moses commanded the Israelites: After the Lord your God shall ye walk (Deut. 13:5), he added the words: Walk ever in his ways (ibid. 19:9). “How can one possibly walk in His ways?” they inquired, since it is written: The Lord, in the whirlwind and the storm is His way, and the clouds are the dust of His feet (Neh. 1:3), and Thy way was in the sea, and Thy path in the great waters, and Thy footsteps not known (Ps. 77:20), and A fire devoureth before Him, and round about Him it stormeth mightily (Ps. 50:3). Moses replied to the Israelites: “Have I not informed you also that His ways are ways of mercy, truth, and loving-kindness,” as it is written: All the paths of the Lord are mercy and truth (ibid. 25:10).