"These acts repeated rise from joys or pains, And swell Imagination's flowing trains; So in dread dreams amid the silent night Grim spectre-forms the shuddering sense affright; Or Beauty's idol-image, as it moves, Charms the closed eye with graces, smiles, and loves; 70 Each passing form the pausing heart delights, And young SENSATION every nerve excites. [Footnote: _And young Sensation_, l. 72. Sensation is an exertion or change of the central parts of the sensorium or of the whole of it, _beginning_ at some of those extreme parts of it which reside in the muscles or organs of sense. Sensitive ideas are those which are preceded by the sensation of pleasure or pain, are termed Imagination, and constitute our dreams and reveries.] "Oft from sensation quick VOLITION springs, When pleasure thrills us, or when anguish stings; Hence Recollection calls with voice sublime Immersed ideas from the wrecks of Time, With potent charm in lucid trains displays Eventful stories of forgotten days. Hence Reason's efforts good with ill contrast, Compare the present, future, and the past; 80 Each passing moment, unobserved restrain The wild discordancies of Fancy's train; But leave uncheck'd the Night's ideal streams, Or, sacred Muses! your meridian dreams. [Footnote: _Quick Volition springs_, l. 73. Volition is an exertion or change of the central parts of the sensorium, or of the whole of it _terminating_ in some of those extreme parts of it which reside in the muscles and organs of sense. The vulgar use of the word _memory_ is too unlimited for our purpose: those ideas which we voluntarily recall are here termed ideas of _recollection_, as when we will to repeat the alphabet backwards. And those ideas which are suggested to us by preceding ideas are here termed ideas of _suggestion_, as whilst we repeat the alphabet in the usual order; when by habits previously acquired B is suggested by A, and C by B, without any effort of deliberation. Reasoning is that operation of the sensorium by which we excite two or many tribes of ideas, and then reexcite the ideas in which they differ or correspond. If we determine this difference, it is called judgment; if we in vain endeavour to determine it, it is called doubting. If we reexcite the ideas in which they differ, it is called distinguishing. If we reexcite those in which they correspond, it is called comparing.]