All other affections have their source in this first movement of the human heart toward the good. Only the good can be loved. In themselves passions are neither good nor evil. They are morally qualified only to the extent that they effectively engage reason and will. It belongs to the perfection of the moral or human good that the passions be governed by reason.
Passions are morally good when they contribute to a good action, evil in the opposite case.
Emotions and feelings can be taken up into the virtues or perverted by the vices. In the Christian life, the Holy Spirit himself accomplishes his work by mobilizing the whole being, with all its sorrows, fears and sadness, as is visible in the Lord's agony and passion. In Christ human feelings are able to reach their consummation in charity and divine beatitude. By his emotions man intuits the good and suspects evil. The principal passions are love and hatred, desire and fear, joy, sadness, and anger.