Related:

• A wish is a desire without an attempt.
• I believe it is an established maxim in morals that he who makes an assertion without knowing whether it is true or false is guilty of falsehood
  and the accidental truth of the assertion does not justify or excuse him. -- Abraham Lincol...
• Hackers do it without you even knowing it.
• It's like signing a 356-page contract without knowing what's in it. -- On getting married
• Youth is a period of missed opportunities without the glory of knowing what was missed.
• Life is knowing how far to go without crossing the line.
• When politics and religion are intermingled, a people is suffused with a sense of invulnerability, and gathering speed in their forward charge, they fail to see the cliff ahead of them.
  -- _Dune_, by Frank Herbe...
• The difference between sentiment and sentimentality is easy to see.
  When you avoid killing somebody's pet on the glazeway, that's sentiment....