Emotions and feelings are the ultimate, sole basis for all human motivation, and are therefore also the sole basis for all human goal setting and meaning-making, and the sole criteria for recognizing when we've met our (emotionally defined) goals.

In other words, all morality stems from emotion and feeling.

Rationality, on the other hand, is simply the act of noticing and recognizing patterns, and using those patterns to help make predictions. Which means that rationality is the ultimate basis for any planning and decision making we might do in pursuit of our goals (which, again, are determined by our emotions).

In other words, emotion and feeling determine the goal itself, rationality determines the strategy for reaching the goal, and emotion and feeling determine whether we've reached the goal.

Emotion and feeling define the two end points, and rationality is what connects them.