"Now, there are two ways in which living power, personal power, the power of a will, may enter a soul and give it life; the one is when God's will works upon us, and the other when our wills work upon one another. God's will may directly penetrate ours, enabling us to will and to do of his good pleasure; and our own wills, thus inspired, may be the torch to kindle other wills with the same inspiration. It is in only one of these two ways that a human soul can be truly inspired; and, without a true inspiration, no amount of instruction, whether in duty, or life, or anything else, will change a single moral propensity."[A] [Footnote A: Seelye: Christian Missions, p. 154.] Even though a Lincoln may rise above his hereditary position or his surroundings, they are the school in which he is trained; the gymnasium in which his mental and moral fibre is strengthened. Family and social life form thus the element of man's environment by which he is mostly moulded, and to which he most naturally and completely conforms. Let us therefore briefly trace the origin of this new element of man's environment, and then notice the effect upon him of conformity to its laws, and see whither these would lead him. We have already seen that intra-uterine development of the young was being carried ever farther by mammals, and we found one explanation of this in the fact that each mammalian egg represented a large amount of nutriment, and that the mammal had very little material to spare for reproduction. Very possibly, too, the newly hatched mammals were exposed to even more numerous and greater dangers than the young of birds. Even among lower mammals the young is feeble at birth. But the human infant is absolutely helpless. And the centre of its helplessness is its brain. Its eyes and ears are comparatively perfect, but its perceptions are very dim. Its muscles are all present, but it must very slowly and gradually learn to use them. Its language is but a cry, its few actions reflex. The new-born kitten may be just as helpless, but in a few weeks it will run and play and hunt, and after a few months can care for itself. Not so the child. It must be cared for during months and years before it can be given independence. Its brain is so marvellously complex that it is finished as a thinking and willing and muscle-controlling mechanism only long after birth. This means a period of infancy during which the young clings helplessly to the mother, who is its natural protector. And during this period the mother and young have to be cared for and protected by the male. And the period of infancy and the protection of the female and young are just as truly, though in far less degree, characteristic of the highest apes as of man.