Date: 1690, 1694, 1695, 1700, 1706

"For, though he that contemplates the Operations of his Mind, cannot but have plain and clear Ideas of them; yet unless he turn his Thoughts that way, and considers them attentively, he will no more have clear and distinct Ideas of all the Operations of his Mind, and all that may be observed ther...

— Locke, John (1632-1704)

Date: 1709, 1714

"They wou'd new frame the Human Heart; and have a mighty Fancy to reduce all its Motions, Ballances and Weights, to that one Principle and Foundation of a cool and deliberate Selfishness."

— Cooper, Anthony Ashley, third earl of Shaftesbury (1671-1713)

Date: 1712

"See, how resistless Orators perswade, / Draw out their Forces, and the Heart invade: / Touch ev'ry Spring and Movement of the Soul, / This Appetite excite, and That controul."

— Blackmore, Sir Richard (1654-1729)

Date: 1712

"Tell us, Lucretius, Epicurus, tell, / And you in Wit unrival'd shall excel, / How thro' the outward Sense the Object flies, / How in the Soul her Images arise. / What Thinking, what Perception is, explain; / What all the airy Creatures of the Brain; / How to the Mind a Thought reflected goes, / ...

— Blackmore, Sir Richard (1654-1729)

Date: 1719

"There are some secret moving Springs in the Affections, which when they are set a going by some Object in View, or be it some Object, though not in View, yet render'd present to the Mind by the Power of Imagination, that Motion carries out the Soul by its Impetuosity to such violent eager Embrac...

— Defoe, Daniel (1660?-1731)

Date: 1723

"Can'st say what diff'rent Turns the Spirits take, / When they of diff'rent Kinds Impressions make; / What vital Springs those Spirits in their Flight / Strike to cause Torment, what to give Delight."

— Blackmore, Sir Richard (1654-1729)

Date: 1733-4

"Self-love, the spring of motion, acts the soul; / Reason's comparing balance rules the whole."

— Pope, Alexander (1688-1744)

Date: 1744, 1772, 1795

"Passion's fierce illapse / Rouzes the mind's whole fabric; with supplies / Of daily impulse keeps the elastic powers / Intensely poiz'd, and polishes anew / By that collision all the fine machine: / Else rust would rise, and foulness, by degrees / Incumbering, choak at last what heaven design'd ...

— Akenside, Mark (1720-1771)

Date: 1758, 1781

"Hence then the Cause of all Defects is seen, / one wrong Movement spoils the whole Machine."

— Hawkins, William (1721-1801)

Date: 1784

"Thy piercing thought / Unaided saw each movement of the mind, / As skilful artists view the small machine, / The secret springs and nice dependencies, / And to thy mimic scenes, by fancy wrought / To such a wond'rous shape, th'impassion'd breast / In floods of grief, or peals of laughter bow'd, ...

— Jago, Richard (1715-1781)