Here are some of my favorite passages:
2:47 - You have a right to perform your prescribed duty, but you are not entitled to the fruits of action. Never consider yourself the cause of the results of your activities, and never be attached to not doing your duty.
2:48 - Perform your duty equiposed, O Arjuna, abandoning all attachement to success or failure. Such equanimity is called yoga.
5:20 - A person who neither rejoinces upon achieving something
pleasant nor laments upon obtaining something unpleasant, who is self-intelligent, who is unbewildered, and who knows the science of God, is already situated in transcendence.
6:6 - For him who has conquered the mind, the mind is the best of friends; but for one who has failed to do so, his mind will remian the greatest enemy.
6:16 - There is no possibility of one's becoming a yogi, O Arjuna, if one eats too much or eats too little, sleeps too much or does not sleep enough.
12:6-20 - But those who worship Me, giving up all their activities unto Me and being devoted to Me without deviation, engaged in devotional service and always meditating upon Me, having fixed their minds upon Me, O son of Prtha - for them I am the swift deliverer from the ocean of birth and death.
Just fix your mind upon Me, the Supreme Personality of Godhead, and engage all your intelligence in Me. Thus you will live in Me always, without a doubt.
My dear Arjuna, O winner of wealth, if you cannot fix your mind upone Me without deviation, then follow the regulative principles of bhakti-yoga. In this way develop a desire to attain Me.
If you cannot practice the regulations of bhakti-yoga, then just try to work for Me, because by working for Me you will come to the perfect stage.
If, however, you are unable to work in this consciousness of Me, then try to act giving up all results of your work and try to be self-situated.
If you cannot take to this practice, then engage yourself in the cultivation of knowledge. Better than knowledge, however, is mediation, and better than mediation is renunciation of the fruits of action, for by such renunciation one can attain peace of mind.
One who is not envious but is a kind friend to all living entities, who does not think himself a proprietor and is free from false ego, who is equal in both happiness and distress, who is tolerant, always satisfied, slef controlled, and engaged in devotional service with determination, his mind and intelligence fixed on Me - such a devotee of Mine is very dear to Me.
He by whome no one is put into difficulty and who is not distrubed by anyone, who is equipoised in happiness and distress, fear and anxiety, is very dear to Me.
My devotee who is not dependent on the ordinary course of activities, who is pure, expert, without cares, free from all pains, and not striving for some result, is very dear to Me.
One who neither rejoices nor grieves, who neither laments nor desires, and who renounces both auspicious and inauspicious things - such a devotee is very dear to Me.
One who is equal to friends and enemies, who is equipoised in honor and dishonor, heat and cold, hapiness and distress, fame and infamy, who is always free from contaminating association, always silent and satisfied with anything, who doesn't care for any residence , who is fixed in knowledge and who is engaged in devotional service - such a person is very dear to Me.
Those who follow this imperishable path of devotional service and who completely engage themselves with faith, making Me the supreme goal, are very, very dear to Me.