Where danger shews it self, apprehension cannot, without stupidity, be wanting; where danger is, sense of danger should be; and so much fear as should keep us awake, and excite our attention, industry, and vigour; but not to disturb the calm use of our reason, nor hinder the execution of what that dictates.
John LockeOne unerring mark of the love of truth is not entertaining any proposition with greater assurance than the proofs it is built upon will warrant.
John LockeThe difference, so observable in men's understandings and parts, does not arise so much from their natural faculties, as acquired habits.
John Locke