Good stuff from Denise Sproul, RC, Jr.'s wife, in the Sept/Oct 2006 issue of Every Though Captive, page 7:
"We have not purged Darwinism from our minds even if we can give a cogent defense against macroevolution.... One way Darwinism affects our thinking is when we excuse sin because of the supposed inevitability of these stages... It is disturbing that many folks even in Christian circles assume that the so-called Terrible Twos are an inevitable part of being a child. Where in Scripture does it mention anything about that? Does it say to spare the rod and spoil the child - except when he's two, because you just can't do anything about that 'stage,' so don't even try?.... It is only 'normal' insofar as sin is normal. The only thing terrible about being two is that two year olds have indeed descended from Adam, and so are sinners, as they were at one and as they will be at three. The only solution at all ages is to repent and believe the Gospel....
"Where does the Lord in Holy Writ instruct us as Christian parents that we should just throw up our hands when our children turn thirteen because what can you do?.... Our children do not simply develop... through an unavoidable set of stages that can't be changed or influenced. Instead, our children are to grow in grace. The movement is... from less obedient to more obedient."