There are some people who believe that they are reciting their blessings when in reality their blessings are disqualified because they swallow or skip words. Such people sin doubly: since what they are saying is not a blessing, they are de facto enjoying [the food etc.] without reciting the blessing and they utter the Name of Hashem in vain. The cause of this is their habit of reciting blessings rapidly — which is a bad thing on its own, for even if the person saying the blessing would make sure to say every word, it is still disgraceful to throw out a hurried and hasty blessing to the King of Glory! Therefore every God-fearing person should accept upon himself, with full conviction, and exert every effort to recite the blessings out loud — letter by letter and word for word — gladly and joyfully. This is the ultimate for a person; that he fulfill every good thing in the best way it should be fulfilled, and that is a sign that he is himself a good person.
כ״ו באייר ה׳תש״פ
My brother and my nation, take this Torah book, in this and like this learn well, listen and revival your soul, you will achieve joy and joy, in this world and next world. (from introduction of the author) 1