Inspiration and T’shuva
The Rebbe Rashab explains in the first ma’amer of Samach Vov, that there is a difference between r’usa d’liba (awakening of the heart, inspiration) and t’shuva (return). He explains that the difference lies in the approach.
Inspiration is a result of realizing that one is in the presence of something greater, namely G-d, and wanting to be a part of this greater being.
T’shuva on the other hand is a result of realizing how far one is from G-d followed by a desire to return to Him.