The acts of the mind, wherein it exerts its power over simple ideas, are chiefly these three: 1. Combining several simple ideas into one compound one, and thus all complex ideas are made. 2. The second is bringing two ideas, whether simple or complex, together, and setting them by one another so as to take a view of them at once, without uniting them into one, by which it gets all its ideas of relations. 3. The third is separating them from all other ideas that accompany them in their real existence: this is called abstraction, and thus all its general ideas are made.
John LockeI am sure, zeal or love for truth can never permit falsehood to be used in the defense of it.
John LockeMen in great fortunes are strangers to themselves, and while they are in the puzzle of business, they have no time to tend their health either of body or mind.
John Locke