I see I have collected the 'smooth motion" references here:
Diogenes Laertius Book II Aristippus
"He laid down as the end the smooth motion resulting in sensation."
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RE: Epicurus And Pleasure As The Awareness Of Smooth Motion
Text references to smooth motion or smoothness:
Diogenes Laertius Book II Aristippus
"He laid down as the end the smooth motion resulting in sensation."
Lucretius Book Two (Bailey):
[398] There is this too that the liquids of honey and milk give a pleasant sensation of the tongue, when rolled in the mouth; but on the other hand, the loathsome nature of wormwood and biting centaury set the mouth awry by their noisome taste; so that you may easily know that those things which can touch the senses…
Diogenes Laertius Book II Aristippus
"He laid down as the end the smooth motion resulting in sensation."
Lucretius Book Two (Bailey):
[398] There is this too that the liquids of honey and milk give a pleasant sensation of the tongue, when rolled in the mouth; but on the other hand, the loathsome nature of wormwood and biting centaury set the mouth awry by their noisome taste; so that you may easily know that those things which can touch the senses…
Cassius