Galatians 5:22-23

But the fruit of the Spirit (the result of His presence within us) is love, joy, peace patience, kindness, goodness, faithfulness, gentleness, self-control. Against such a thing there is no law.

The fruit of the Spirit lives in our spirit, and we can tap into it anytime. We cannot go by our feelings and emotions and expect to have the list above. Feelings change constantly depending on our circumstances. Our spirit remains constant.  If we want peace, we must choose to follow our spirit, not our flesh.