Related:

• There are some people that, if they don't know, you can't tell them.
  You can tell a teacher as far as you can see one, but you can't tell them much....
• You can tell a doctor as far as you can see him, but you can't tell him much.
• You can't know too much, but you can say too much. -- Calvin Coolidge
• Too bad, Bob , but you know too much.
• Abe: Hello. As you may know, I might not be around much longer.
  So, I've decided to give you your inheritance before I die....
• It is too far up for you to reach.
• Go as far as you can see, and when you get there, you will see farther.
• You may be deceived if you trust too much, but you will live in torment if you do not trust enough.
  -- Frank Crane...
• Tact in audacity is knowing how far you can go without going too far. -- Jean Cocteau