Of the Agent who accomplishes this great transformation there is need only to say that He is free in His operation and also inscrutable. He is like the wind, our Lord tells us, that blows where it lists. We cannot bring the Spirit at will; we cannot use Him as if He were some unintelligent passive instrument; neither can we subject all His operations to our control. The grub must wait for those natural influences which are to transform it; it cannot command them. We cannot command the Spirit; but we, being free agents also, can do more than wait,--we can pray, and we can strive to put ourselves in line with the Spirit's operation. Seamen cannot raise the wind nor direct its course, but they can put themselves in the way of the great regular winds. We can do the same: we can slowly, by mechanical helps, creep into the way of the Spirit; we can set our sails, doing all we think likely to catch and utilize His influences--believing always that the Spirit is more desirous than we are to bring us all to good. Why He breathes in one place while all around lies in a dead calm we do not know; but as for the wind's variations so for His, there are doubtless sufficient reasons. We need not expect to see the Spirit's working separate from the working of our own minds; we cannot see the Spirit in Himself--we cannot see the wind that moves the ships, but we can see the ships moving, and we know that without the wind they could not move.
If this, then, be the line on which our human nature can alone be developed, if a profound harmony with God be that which can alone give permanence and completeness to our nature, if in accordance with all that we see in the world around us some men fail of attaining the end of their creation, and lie for ever blighted and useless, while others are carried forward to fuller and more satisfying life, we cannot but ask with some anxiety to which class we belong. Good and evil are in the world, happiness and misery, victory and defeat; do not let us deceive ourselves by acting as if there were no difference between these opposites, or as if it mattered little in our case whether we belong to the one side or the other. It matters everything: it is just the difference between eternal life and eternal death. Christ did not come to play with us, and startle us with idle tales. He is the centre and fountain of all truth, and what He says fits in with all we see in the world around us.
But in endeavouring to ascertain whether the great change our Lord speaks of has passed upon us, our object must be not so much to ascertain the time and manner of our new birth as its reality. A man may know that he has been born though he is not able to recall, as no man can recall, the circumstances of his birth. Life is the great evidence of birth, natural or spiritual. We may desire to know the time and place of birth for some other reason, but certainly not for this, to make sure we have been born. Of that there is sufficient evidence in the fact of our being alive. And spiritual life quite as certainly implies spiritual birth.
Again, we must keep in view that a man may be born though not yet full grown. The child of a day old has as truly and certainly a human nature as the man in his prime. He has a human heart and mind, every organ of body and soul, though as yet he cannot use them. So the second birth impresses the image of God on every regenerate soul. It may not as yet be developed in every part, but all its parts are there in germ. It is not a partial but a complete result which regeneration effects. It is not one member, a hand or a foot that is born, but a body, a complete equipment of the soul in all graces. The whole character is regenerated, so that the man is fitted for all the duties of the Divine life whensoever these duties shall come before him. A human child does not need additions made to it to fit it for new functions: it requires growth, it requires nurture, it requires education and the practice of human ways, but it requires no new organ to be inserted into its frame; once born it has but to grow in order to adapt itself with ease and success to all human ways and conditions. And if regenerate we have that in us which with care and culture will grow till it brings us to perfect likeness to Christ. If we are not growing, if we remain small, puny, childish while we should be adult and full grown, then there is something seriously wrong, which calls for anxious enquiry.