The Habit of Doubt

There is nothing more dreadful than the habit of doubt. Doubt separates people. It is a poison that disintegrates friendships and breaks up pleasant relations. It is a thorn that irritates and hurts; it is a sword that kills.
_Buddha

Doubt or Expectancy

Doubt is a one-way street to failure; positive expectancy is a super- highway toward achievement.
_William Arthur Ward