These considerations also remove the objection arising from the impossibility of Ocularly following the lines in their prolongation to infinity, for though, in order actually to see that two given lines never meet, it would be necessary to follow them to infinity; yet without doing so we may know that if they ever do meet, or if, after diverging from one another, they begin again to approach, this must take place not at an infinite, but at a finite distance.
"A System Of Logic, Ratiocinative And Inductive (Vol. 1 of 2)"
John Stuart Mill
They may help to make the object Ocularly more apparent, but they do not make the feeling a party to the movement.
"Essays Æsthetical"
George Calvert