Charles H. Spurgeon on Psalms 18:26

"With the pure thou wilt shew thyself pure; and with the froward thou wilt shew thyself froward." The sinner's frowardness is sinful and rebellious, and the only sense in which the term can be applied to the Most Holy God is that of judicial opposition and sternness, in which the Judge of all the earth will act at cross-purposes with the offender, and let him see that all things are not to be made subservient to wicked whims and wilful fancies. Calvin very forcibly says, "This brutish and monstrous stupidity in men compels God to invent new modes of expression, and as it were to clothe himself with a different character." There is a similar sentence in Leviticus 26:21-24, where God says, "and if ye walk contrary unto (or perversely with) me, then I will also walk contrary unto (or perversely, or roughly, or at random with) you." As if he had said that their obstinacy and stubbornness would make him on his part forget his accustomed forbearance and gentleness, and cast himself recklessly or at random against them. We see then what the stubborn at length gain by their obduracy; it is this, that God hardens himself still more to break them in pieces, and if they are of stone, he causes them to feel that he has the hardness of iron." The Jewish tradition was that the manna tasted according to each man's mouth; certainly God shows himself to each individual according to his character.