cess of Reasoning, he is engag'd to draw this Inference. But still he finds himself determin'd to draw it: And tho' he should be convinc'd, that his Understanding has no Part in the Operation, he would nevertheless continue in the same Course of Thinking. There is some other Principle, which determines him to form such a Conclusion.
This Principle is Custom or Habit. For where-ever the Repetition of any particular Act or Operation produces a Propensity to renew the same Act or Operation, without being impell'd by any Reasoning or Process of the Understanding; we always say, that this Propensity is the Effect of Custom. By employing that Word, we pretend not to have given the ultimate Reason of such a Propensity. We only point out a Principle of human Nature, which is universally acknowledg'd, and which is well known by its Effects. Perhaps, we can push our Enquiries no farther, or pretend to give the Cause of this Cause; but must rest contented with it as the ultimate Principle, which we can assign, of all our Conclusions from Experience. 'Tis sufficient Satisfaction, that we can go so far; without repining at the Narrowness of our Faculties, because they will carry us no farther. And 'tis certain we here advance a very intelligible Proposition, at least, if not a true one, when we assert, that, after the constant Conjunction of two Objects, Heat and Flame, for Instance, Weight and Solidity, weare
