I do not know what may appear

I do not know what I may appear to the world; but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, while the great ocean of truth lay all undiscovered before me.  ~Isaac Newton, quoted in Jacob Bronowski, The Ascent of Man, 1973QSCI

Thou art to me a delicious torment

DEAR FRIEND: If I was sure of thee, sure of thy capacity, sure to match my mood with thine, I should never think again of trifles in relation to thy comings and goings.  I am not very wise: my moods are quite attainable: and I respect thy genius: it is to me as yet unfathomed; yet dare I not presume in thee a perfect intelligence of me, and so [T]hou art to me a delicious torment.  Thine ever, or never.  ~Ralph Waldo Emerson, "Friendship"

The only thing necessary for the triumph

The only thing necessary for the triumph of evil is for good men to do nothing.  ~Various wordings of this quotation are attributed to Charles F. Aked and Edmund Burke, among others but no author has yet been confirmed as the originatorquoteinvestigator.com/2010/12/17/meretricious (Thanks, Garson O’Toole of quoteinvestigator.com!)

What counts cant be counted author unknown

[W]hat counts can’t be counted.  ~Author unknown, c.1956 quoted in Political science in the United States of America: a trend report, UNESCO, see also "[N]ot everything that can be counted counts, and not everything that counts can be counted" by William Bruce Cameron, 1963, commonly attributed to Albert Einstein as "Not everything that can be counted counts, and not everything that counts can be counted."quoteinvestigator.com/2010/05/26/everything-counts-einstein (Thanks, Garson O’Toole of quoteinvestigator.com!)