Making your own salvation certain does not mean others make it certain

2 Peter 1:10, Gordon Clark says, "To make my divinely decreed election certain to or for myself is simply a matter of assurance. Simply, not because the doctrine of assurance is guaranteed to be devoid of problems; but because it does not face the impossible problem of making God's decree more certain than God could make it. The text deals with assurance. Kierkegaard, who should never be trusted, has a good point, though even in this case he exaggerates, when he says we must in humility always be certain of others' salvation and always doubtful of our own. The idea of becoming assured of one's own salvation is perfectly Scriptural, and part of the method is self-examination. Therefore one commentator's view that we cannot make our own election sure, on the ground that only God can grant assurance, is without foundation; for though it is God who gives us certainty, he does this through several means. The same commentator's suggestion that Peter refers here to our making our election certain to others by our good works is altogether implausible. The idea of assuring others cannot be found in the text. The middle voice means oneself. The second half of 1:10 clearly indicates the individualism of the argument. Furthermore, since God alone can see and judge the heart, another person, an observer, can never be made certain by my good works. These are observable because external; my internal motives, an indispensable element in my moral standing, the observer cannot see." New Heaven, New Earth