Let no-one enter who does not know his geometry.

-Anonymous
Inscription at the entrance of Plato's  Academy. Reported by commentators on  Aristotle (Elias In  Aristotelis categorias commentarium,18,118,18).

   For my part, when I enter most intimately into what I call myself, I always stumble on some particular perception orother, of heat orcold, light or shade, pain or pleasure.I nevercan catch myself at any time without a perception, and never can observe anything but the perception.

-Hume, David
  A  Treatise of Human Nature, bk.1, pt.4, section 6.

Lifeless in appearance, sluggish dazed spring approachesö They enter the new world naked, cold, uncertain of all save that they enter.

-Williams,William Carlos
  Spring and All,'Spring and All'.