In conclusion
The despondency of Arjuna in the first chapter of the Gita is typically human. Sri Krishna, by sheer power of his inspiring words, changes Arjuna's mind from a state of inertia to one of righteous action, from the state of what the French philosophers call "anomie" or even alienation, to a state of self-confidence in the ultimate victory of "dharma" (ethical action.)

Sri Krishna's advice with regard to temporary failures is, "No doer of good ever ends in misery." Every action should produce results. Good action produces good results and evil begets nothing but evil. Therefore, always act well and be rewarded.

A note on the word "yoga"