Imam Ali (AS) said, So be wary of [your duty towards] Allah with the God-wariness of one who attains certitude hence he does good, who is given lesson [from the happenings of this world] so he takes it, who is warned so he desists, who is shown [the right path] so he sees [it], and who fears the chastisement [of the Hereafter] and works for the Day of Reckoning.