It is "good", lest one remain a machine.

I will not tell you, but I will share my understanding of what we are discussing.

The mindfulness is consciousness becoming aware of itself. In this one becomes progressively aware of their thoughts. Content. Frequency. Patterns. Attention. Awareness. This is both thought and emotion.
The negative path is that based essentially in control. An individual will work to control and determine what emotions and thoughts may be allowed.
The positive path is based essentially in freedom. Those thoughts and emotions not conducive to the individual are relinquished.
The polarities are of the same core; understanding why the thoughts and emotions arise is that which allows progress to be made.

The mind and heart work in tandem to the degree they are active. I do not say "I am doing math now, turn on mind, turn off heart", so to speak.

If you are willing, perhaps you could elaborate on your understanding of mind and heart, feelings, emotions - any of these in any way you like.