[426c]
Socrates
First, then, the letter rho seems to me to be an instrument expressing all motion. We have not as yet said why motion has the name κίνησις; but it evidently should be ἴεσις, for in old times we did not employ eta, but epsilon. And the beginning of κίνησις is from κίειν, a foreign word equivalent to ἰέναι (go). So we should find that the ancient word corresponding to our modern form would be ἴεσις; but now by the employment of the foreign word κίειν, change of epsilon to eta, and the insertion of nu it has become κίνησις, though it ought to be κιείνεσις or εἶσις.
First, then, the letter rho seems to me to be an instrument expressing all motion. We have not as yet said why motion has the name κίνησις; but it evidently should be ἴεσις, for in old times we did not employ eta, but epsilon. And the beginning of κίνησις is from κίειν, a foreign word equivalent to ἰέναι (go). So we should find that the ancient word corresponding to our modern form would be ἴεσις; but now by the employment of the foreign word κίειν, change of epsilon to eta, and the insertion of nu it has become κίνησις, though it ought to be κιείνεσις or εἶσις.
