But to the impious Cain, neither does the earth contribute anything to give him vigour, even though he never concerns himself about anything which is exterior to it; on which account, in the next sentence, he is found "groaning and trembling upon the earth," Genesis iv. 12. that is to say, under the influence of grief and terror; and such also is the miserable life of a wicked man, who has received for his inheritance the most painful of the four passions, pain and terror; the one being equivalent to groaning, and the other to trembling; for it is inevitable, that some evil should either be present to or impending over such a man. Now the expectation of impending evil causes fear, but the suffering of present evil causes pain.