James’s writing on the tongue suggests that taming it is part of the dominion mandate:
For every kind of beast and bird, of reptile and creature of the sea, is tamed and has been tamed by mankind. But no man can tame the tongue. It is an unruly evil, full of deadly poison.
Even though he says here that taming the tongue is impossible, a few verses earlier he says this:
If anyone does not stumble in word, he is a perfect man, able also to bridle the whole body.
In other words, the perfect man rules himself as he rules horses (v. 3), ships (v. 4), and all other created things. I don’t think it’s going to far to say that self-governance is one of Adam’s original tasks.
Christian Leithart 