2. Design. This, therefore, being my purpose- to inquire into the
original, certainty, and extent of human knowledge, together with
the grounds and degrees of belief, opinion, and assent;- I shall not
at present meddle with the physical consideration of the mind; or
trouble myself to examine wherein its essence consists; or by what
motions of our spirits or alterations of our bodies we come to have
any sensation by our organs, or any ideas in our understandings; and
whether those ideas do in their formation, any or all of them,
depend on matter or not. These are speculations which, however curious
and entertaining, I shall decline, as lying out of my way in the
design I am now upon. It shall suffice to my present purpose, to
consider the discerning faculties of a man, as they are employed about
the objects which they have to do with. And I shall imagine I have not
wholly misemployed myself in the thoughts I shall have on this
occasion, if, in this historical, plain method, I can give any account
of the ways whereby our understandings come to attain those notions of
things we have; and can set down any measures of the certainty of
our knowledge; or the grounds of those persuasions which are to be
found amongst men, so various, different, and wholly contradictory;
and yet asserted somewhere or other with such assurance and
confidence, that he that shall take a view of the opinions of mankind,
observe their opposition, and at the same time consider the fondness
and devotion wherewith they are embraced, the resolution and eagerness
wherewith they are maintained, may perhaps have reason to suspect,
that either there is no such thing as truth at all, or that mankind
hath no sufficient means to attain a certain knowledge of it.

  3. Method. It is therefore worth while to search out the bounds
between opinion and knowledge; and examine by what measures, in things
whereof we have no certain knowledge, we ought to regulate our
assent and moderate our persuasion. In order whereunto I shall
pursue this following method:-

  First, I shall inquire into the original of those ideas, notions, or
whatever else you please to call them, which a man observes, and is
conscious to himself he has in his mind; and the ways whereby the
understanding comes to be furnished with them.

  Secondly, I shall endeavour to show what knowledge the understanding
hath by those ideas; and the certainty, evidence, and extent of it.

  Thirdly, I shall make some inquiry into the nature and grounds of
faith or opinion: whereby I mean that assent which we give to any
proposition as true, of whose truth yet we have no certain
knowledge. And here we shall have occasion to examine the reasons
and degrees of assent.

  4. Useful to know the extent of our comprehension. If by this
inquiry into the nature of the understanding, I can discover the
powers thereof; how far they reach; to what things they are in any
degree proportionate; and where they fail us, I suppose it may be of
use to prevail with the busy mind of man to be more cautious in
meddling with things exceeding its comprehension; to stop when it is
at the utmost extent of its tether; and to sit down in a quiet
ignorance of those things which, upon examination, are found to be
beyond the reach of our capacities. We should not then perhaps be so
forward, out of an affectation of an universal knowledge, to raise
questions, and perplex ourselves and others with disputes about things
to which our understandings are not suited; and of which we cannot
frame in our minds any clear or distinct perceptions, or whereof (as
it has perhaps too often happened) we have not any notions at all.
If we can find out how far the understanding can extend its view;
how far it has faculties to attain certainty; and in what cases it can
only judge and guess, we may learn to content ourselves with what is
attainable by us in this state.

  5. Our capacity suited to our state and concerns. For though the
comprehension of our understandings comes exceeding short of the
vast extent of things, yet we shall have cause enough to magnify the
bountiful Author of our being, for that proportion and degree of
knowledge he has bestowed on us, so far above all the rest of the
inhabitants of this our mansion. Men have reason to be well
satisfied with what God hath thought fit for them, since he hath given
them (as St. Peter says) pana pros zoen kaieusebeian, whatsoever is
necessary for the conveniences of life and information of virtue;
and has put within the reach of their discovery, the comfortable
provision for this life, and the way that leads to a better. How short
soever their knowledge may come of an universal or perfect
comprehension of whatsoever is, it yet secures their great
concernments, that they have light enough to lead them to the
knowledge of their Maker, and the sight of their own duties. Men may
find matter sufficient to busy their heads, and employ their hands
with variety, delight, and satisfaction, if they will not boldly
quarrel with their own constitution, and throw away the blessings
their hands are filled with, because they are not big enough to
grasp everything. We shall not have much reason to complain of the
narrowness of our minds, if we will but employ them about what may
be of use to us; for of that they are very capable. And it will be
an unpardonable, as well as childish peevishness, if we undervalue the
advantages of our knowledge, and neglect to improve it to the ends for
which it was given us, because there are some things that are set
out of the reach of it. It will be no excuse to an idle and untoward
servant, who would not attend his business by candle light, to plead
that he had not broad sunshine. The Candle that is set up in us shines
bright enough for all our purposes. The discoveries we can make with
this ought to satisfy us; and we shall then use our understandings
right, when we entertain all objects in that way and proportion that
they are suited to our faculties, and upon those grounds they are
capable of being proposed to us; and not peremptorily or intemperately