The last indeed is the most _hazardous_ Enterprize, and yet the most _necessary_; and that is, to take such care that the _Judgment_ and the _Reason_ of Man (which is the third Faculty to be repair’d and improv’d) should receive such assistance, as to avoid the dangers to which it is by nature most subject. The Imperfections, which I have already mention’d, to which it is lyable, do either belong to the _extent_, or the _goodness_ of its knowledge; and here the difficulty is the greater, least that which may be thought a _remedy_ for the one should prove _destructive_ to the other, least by seeking to inlarge our Knowledge, we should render it weak and uncertain; and least by being too scrupulous and exact about every Circumstance of it, we should confine and streighten it too much. In both these the middle wayes are to be taken, nothing is to be_ omitted_, and yet every thing to pass a _mature deliberation_: No _Intelligence_ from Men of all Professions, and quarters of the World, to be _slighted_, and yet all to be so _severely examin’d_, that there remain no room for doubt or instability; much _rigour_ in admitting, much _strictness_ in comparing, and above all, much _slowness_ in debating, and _shyness_ in determining, is to be practised. The _Understanding_ is to _order_ all the inferiour services of the lower Faculties; but yet it is to do this only as a _lawful Master_, and not as a _Tyrant._ It must not _incroach_ upon their Offices, nor take upon it self the employments which belong to either of them. It must _watch_ the irregularities of the Senses, but it must not go before them, or _prevent_ their information. It must _examine_, _range_, and _dispose_ of the bank which is laid up in the Memory: but it must be sure to make _distinction_ between the _sober_ and _well collected heap_, and the _extravagant Ideas_, and _mistaken Images_, which there it may sometimes light upon. So many are the _links_, upon which the true Philosophy depends, of which, if any one be _loose_, or _weak_, the whole _chain_ is in danger of being dissolv’d; it is to _begin_ with the Hands and Eyes, and to _proceed_ on through the Memory, to be _continued_ by the Reason; nor is it to stop there, but to _come about_ to the Hands and Eyes again, and so, by a _continual passage round_ from one Faculty to another, it is to be maintained in life and strength, as much as the body of man is by the _circulation_ of the blood through the several parts of the body, the Arms, the Feet, the Lungs, the Heart, and the Head.