A thought is a recognized or a focused contemplation on a particular emotion, state, thing or person. It is a mental process and is distinguishable from feelings, which is more related to emotions and matters of the heart, and can be considered as unconscious thought. When a person reflects on the origin, nature and effect of his emotions or feelings, he gets deeper understanding of his emotions, and feelings and can devise ways to control, manage or express his feelings, as the case may be. A focused, thoughtful approach brandishes a person with the knowledge to handle emotions and situations in a more mature and realistic way.
The Complete Psychological Writings of Mark Pettinelli has an interesting module on The Psychology of Emotions, Feelings and Thoughts.