A wise mind is one which considers both the rational mind and the emotional mind. Why does the emotional mind matter at all?
I think this is because our experience of the world is an emotional one. We have emotional bodies – feelings course through it like blood.
Think of happiness – it can be a goal in and of itself. And unhappiness can be such a driver of human behavior.
Because we are unable to actually live without emotion, therefore we must take it into consideration. When we feel something, we validate it as it makes sense given our life experience.
The challenge is when emotions become so powerful, that the capability of the wise mind degenerates. Then behaviors can result which affect our functioning in the world. This is when we need special tools to help us regulate those emotions.