Related:

• Modest doubt is call'd The beacon of the wise, the tent that searches To the bottom of the worst.
  -- William Shakespeare (1564-1616), Troilus and Cressida -- Act ii, Sc. 2...
• I pull in resolution, and begin To doubt the equivocation of the fiend That lies like truth
  Fear not, till Birnam wood Do come to Dunsinane." -- William Shakespeare (1564-1616), Macbeth -- Act v, Sc....
• No hinge nor loop To hang a doubt on. -- William Shakespeare (1564-1616), Othello -- Act iii, Sc.
  3...
• To be once in doubt Is once to be resolv'd. -- William Shakespeare (1564-1616), Othello -- Act iii, Sc.
  3...
• When in doubt, fire photons!
• O Jephthah, judge of Israel, what a treasure hadst thou!
  -- William Shakespeare (1564-1616), Hamlet -- Act ii, Sc. 2...
• When in doubt, fuck it. When not in doubt... get in doubt!
• I may be wrong, but I'm never in doubt!
• If in doubt, mumble.