Love may not be natural. It has to be induced, created, and developed by our intelligence. The mind is the ultimate controller of the human being. The mind controls the heart and emotions of the human being.
Our love of G-d is built on the understanding and recognition of the oneness of G-d Almighty in the world. Thus, the Shema is a product of this intellectual process.
When you get into love of G-d it is not natural. No one wakes up in the morning and says:” Oh G-d I love you.” You can only create the love of G-d when you understand who G-d is, who we are and what G-d does for us.