=234.= In order to reconcile the doctrines of causality and possibility, we must first distinguish between outer and inner compulsion, between ‘proximate’ and ‘principal’ causes. If a boy starts a cylinder rolling down hill, he gives it an opportunity without which it could not have rolled; this is the proximate cause (προκαταρκτική, _proxima_). But the cylinder would not continue rolling except by an inner compulsion, a law within itself, by which it is the nature of cylinders to roll downwards[82]. This is the leading or principal cause (προηγουμένη, _antecedens_ or _principalis_). So neither in thought nor in action can a man form a judgment, unless there be a picture (φαντασία, _visum_) presented to his mind. The picture is a proximate cause[83]. But assent to the picture rests with the man himself; the man himself, his reason, his will, is the principal cause. Here we touch on the dogma which is the foundation of ethics: ‘assent is in our power.’ Upon this rests the right of the philosopher to praise or blame, the right of the lawgiver to reward and punish. [Sidenote: The divine nature immutable.] =235.= We have to investigate further the inner compulsion, the principal cause. With regard to the gods their own disposition is a law to them, their character holds them to their purpose, their majesty makes their decrees immutable[84]. This is the final answer of philosophy, even though men cannot content themselves with it. Even amongst those most disposed to accept Stoic principles, there is a wish that the gods should be allowed a little _play_, a choice at any rate in small matters not hampered by considerations of destiny and morality[85]; and upon this issue the poet may deviate a little from the sterner creed of the philosopher[86]. Nor must we so interpret the wisdom and benevolence of the gods as to deny the efficacy of prayer[87]. [Sidenote: Man’s wickedness.] =236.= In the case of men free will comes accompanied by a heavy burden of responsibility; for by its exercise men have defied the gods and brought evil into the world. In vain they accuse the gods and destiny, when their own perverseness has exaggerated their destiny, as Homer bears witness: ‘Lo you now, how vainly mortal men do blame the gods! For of us they say comes evil, whereas they even of themselves, through the blindness of their own hearts, have sorrows beyond that which is ordained[88].’ ‘Through the blindness of their own hearts they perished, fools[89].’