Nature, I confess, has put into man a desire of happiness and an aversion to misery: these indeed are innate practical principles which (as practical… - John Locke

There cannot any one moral Rule be propos'd, whereof a Man may not justly demand a Reason.

But yet possibly it will still be objected, suppose I wholly lose the memory of some parts of my life, beyond a possibility of retrieving them, so that perhaps I shall never be conscious of them again; yet am I not the same person, that did those actions, had those thoughts, that I once was conscious of, though I have now forgot them? To which I answer, that we must here take notice what the word I is applied to, which in this case is the man only. And the same man being presumed to be the same person, I is easily here supposed to stand also for the same person. But if it be possible for the same man to have distinct incommunicable consciousness at different times, it is past doubt the same man would at different times make different persons

And because it may be too great a temptation to human frailty, apt to grasp at power, for the same persons, who have the power of making laws, to have also in their hands the power to execute them, whereby they may exempt themselves from obedience to the laws they make, and suit the law, both in its making, and execution, to their own private advantage...