I don’t like the way Spurgeon often spiritualizes the OT (probably the result of his reading the OT in light of the NT). However, I’ve never read anything unorthodox from him; I just don’t care for his exegetical method all the time. That said, Spurgeon says some great thing about this passage in his Treasury of David–
“Behold, children are a gift of the Lord, the fruit of the womb is a reward”
[God] gives children, not as a penalty nor as a burden, but as a favor. They are a token for good if men know how to receive them, and educate them. They are ‘doubtful blessings’ only because we are doubtful persons. Where society is rightly ordered children are regarded, not as an incumbrance, but as an inheritance; and they are received, not with regret, but as a reward.
“Like arrows in the hand of a warrior, so are the children of one’s youth.”
To this end we must have our children in hand while they are yet children, or they are never likely to be so when they are grown up; and we must try to point them and straighten them, so as to make arrows of them in their youth, lest they should prove crooked and unserviceable in after life. Let the Lord favor us with loyal, obedient, affectionate offspring, and we shall find in them our best helpers. We shall see them shot forth into life to our comfort and delight, if we take care from the very beginning that they are directed to the right point.
When sons and daughters are arrows, it is well to have a quiver full of them; but if they are only sticks, knotty and useless, the fewer of them the better.
Moreover, a quiver may be small and yet full; and then the blessing is obtained. In any case we may be sure that a man’s life consisteth not in the abundance of children that he possesseth.
“How blessed is the man whose quiver is full of them; they will not be ashamed when they speak with their enemies in the gate”
Those who have many gracious children are upon the whole the happiest. Of course a large number of children means a large number of trials; but when these are met by faith in the Lord it also means a mass of love, and a multitude of joys.