1. Sometimes our trust in our powers of reasoning and memory, that is, our implicit assent to their telling truly, is treated as a first principle; but we cannot properly be said to have any trust in them as faculties. At most we trust in particular acts of memory and reasoning. We are sure there was a yesterday, and that we did this or that in it; we are sure that three times six is eighteen, and that the diagonal of a square is longer than the side. So far as this we may be said to trust the mental act, by which the object of our assent is verified; but, in doing so, we imply no recognition of a general power or faculty, or of any capability or affection of our minds, over and above the particular act. We know indeed that we have a faculty by which we remember, as we know we have a faculty by which we breathe; but we gain this knowledge by abstraction or inference from its particular acts, not by direct experience. Nor do we trust in the faculty of memory or reasoning as such, even after that we have inferred its existence; for its acts are often inaccurate, nor do we invariably assent to them. However, if I must speak my mind, I have another ground for reluctance to speak of our trusting memory or reasoning, except indeed by a figure of speech. It seems to me unphilosophical to speak of trusting ourselves. We are what we are, and we use, not trust our faculties. To debate about trusting in a case like this, is parallel to the confusion implied in wishing I had had a choice if I would be created or no, or speculating what I should be like, if I were born of other parents. “Proximus sum egomet mihi.” Our consciousness of self is prior to all questions of trust or assent. We act according to our nature, by means of ourselves, when we remember or reason. We are as little able to accept or reject our mental constitution, as our being. We have not the option; we can but misuse or mar its functions. We do not confront or bargain with ourselves; and therefore I cannot call the trustworthiness of the faculties of memory and reasoning one of our first principles.