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[youtube https://www.youtube.com/watch?v=9zKXCQpUnMg?wmode=transparent&autohide=1&egm=0&hd=1&iv_load_policy=3&modestbranding=1&rel=0&showinfo=0&showsearch=0&w=500&h=375] “Doubt sometimes tends to call on reason. It may encourage people to hesitate before acting, and/or to apply more rigorous methods. Doubt may have particular importance as leading towards disbelief or non-acceptance.”(Source: https://www.youtube.com/)