If one wishes to be a mechanic, a doctor, a lawyer, a burger flipper or anything else in this life one must learn what is required for success and perfect that skill set. Why would emunah or motivating faith be any different? Motivating faith (or emunah in Hebrew) must be intentionally developed with accurate knowledge coupled with personal experience and intent. The twofold foundation of emunah is Torah and Hitbodedut (personal private prayer). A person with proper understanding of Torah (the Jewish Scriptures) who invests time in Hitbodedut will most certainly develop ever deeper emunah. Through emunah one merits to experience great joy and contentment.
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