'Instinct' in the Bible

For I do not understand my own actions [I am baffled and bewildered by them]. I do not practice what I want to do, but I am doing the very thing I hate [and yielding to my human nature, my worldliness—my sinful capacity].

But these [false teachers], like unreasoning animals, [mere] creatures of instinct, born to be captured and destroyed, reviling things they do not understand, will also perish in their own corruption [in their destroying they will be destroyed],

But these men sneer at anything which they do not understand; and whatever they do know by [mere] instinct, like unreasoning and irrational beasts—by these things they are destroyed.