Your mind and heart need to build a relationship slowly, somewhat like a pet and its master.
At first, your mind needs to hold your heart tightly on a leash. Your heart screams, “I must have this! I must go there!” And your mind says, “Calm down. We talked this over already and we both agreed you don’t need to.”
The heart screams, “But now I feel I need to! If I don’t, who knows what will happen!”
And the mind says, “That’s because you are a heart. Hearts feel that way. But I am a mind and I know we will survive even if you don’t.”
Eventually, the heart learns the paths and gallops along them with ease. It becomes a mindful heart.
The use of the word "heart" in many texts, is used as a metaphor for feeling. For example, "heartfelt", heartbreak, "heartless". Should we not replace it with our soul, our g-dly soul?
Our earthly body often behaves badly, challenging our g-dly soul that yearns to remain close to Hashem.
Could we then say, "Let your mind (good behavior) help your soul become a happy soul" ?
As the body has a mind and heart, so too the soul.
Indeed, the body is only a pale mirror of the soul.