If I feel depressed I will sing. If I feel sad I will laugh. If I feel ill I will double my labor. If I feel fear I will plunge ahead. If I feel inferior I will wear new garments. If I feel uncertain I will raise my voice. If I feel poverty I will think of wealth to come. If I feel incompetent I will think of past success. If I feel insignificant I will remember my goals. Today I will be the master of my emotions.
You can't expect to prevent negative feelings altogether. And you can't expect to experience positive feelings all the time. The Law of Emotional Choice directs us to acknowledge our feelings but also to refuse to get stuck in the negative ones.
We find nothing easier than being wise, patient, superior. We drip with the oil of forbearance and sympathy, we are absurdly just, we forgive everything. For that very reason we ought to discipline ourselves a little; for that very reason we ought to cultivate a little emotion, a little emotional vice, from time to time. It may be hard for us; and among ourselves we may perhaps laugh at the appearance we thus present. But what of that! We no longer have any other mode of self-overcoming available to us: this is our asceticism, our penance.
It is very difficult to be wholly joyous or wholly sad on this earth. The comic, when it is human, soon takes upon itself a face of pain; and some of our grieves... have their source in weaknesses which must be recognized with smiling compassion as the common inheritance of us all.