BG 2.12: Never was there a time when I did not exist, nor you, nor all these kings; nor in the future shall any of us cease to be.
BG 2.13: As the embodied soul continuously passes, in this body, from boyhood to youth to old age, the soul similarly passes into another body at death. A sober person is not bewildered by such a change.
BG 2.14: O son of Kuntī, the nonpermanent appearance of happiness and distress, and their disappearance in due course, are like the appearance and disappearance of winter and summer seasons. They arise from sense perception, O scion of Bharata, and one must learn to tolerate them without being disturbed.
BG 2.15: O best among men [Arjuna], the person who is not disturbed by happiness and distress and is steady in both is certainly eligible for liberation.
BG 2.16: Those who are seers of the truth have concluded that of the nonexistent [the material body] there is no endurance and of the eternal [the soul] there is no change. This they have concluded by studying the nature of both.
BG 2.17: That which pervades the entire body you should know to be indestructible. No one is able to destroy that imperishable soul.
BG 2.20: For the soul there is neither birth nor death at any time. He has not come into being, does not come into being, and will not come into being. He is unborn, eternal, ever-existing and primeval. He is not slain when the body is slain.
BG 2.23: The soul can never be cut to pieces by any weapon, nor burned by fire, nor moistened by water, nor withered by the wind.
BG 2.24: This individual soul is unbreakable and insoluble, and can be neither burned nor dried. He is everlasting, present everywhere, unchangeable, immovable and eternally the same.
BG 2.25: It is said that the soul is invisible, inconceivable and immutable. Knowing this, you should not grieve for the body.
BG 2.27: One who has taken his birth is sure to die, and after death one is sure to take birth again. Therefore, in the unavoidable discharge of your duty, you should not lament.
BG 2.29: Some look on the soul as amazing, some describe him as amazing, and some hear of him as amazing, while others, even after hearing about him, cannot understand him at all.
BG 9.2: This knowledge is the king of education, the most secret of all secrets. It is the purest knowledge, and because it gives direct perception of the self by realization, it is the perfection of religion. It is everlasting, and it is joyfully performed.
BG 7.7: O conqueror of wealth, there is no truth superior to Me. Everything rests upon Me, as pearls are strung on a thread.
BG 10.41: Know that all opulent, beautiful and glorious creations spring from but a spark of My splendor.
BG 16.1-3: Fearlessness; purification of one's existence; cultivation of spiritual knowledge; charity; self-control; performance of sacrifice; study of the Vedas; austerity; simplicity; nonviolence; truthfulness; freedom from anger; renunciation; tranquillity; aversion to faultfinding; compassion for all living entities; freedom from covetousness; gentleness; modesty; steady determination; vigor; forgiveness; fortitude; cleanliness; and freedom from envy and from the passion for honor — these transcendental qualities, O son of Bharata, belong to godly men endowed with divine nature.
And these four verses are considered by some to be the most important.
BG 10.8: I am the source of all spiritual and material worlds. Everything emanates from Me. The wise who perfectly know this engage in My devotional service and worship Me with all their hearts.
BG 10.9: The thoughts of My pure devotees dwell in Me, their lives are fully devoted to My service, and they derive great satisfaction and bliss from always enlightening one another and conversing about Me.
BG 10.10: To those who are constantly devoted to serving Me with love, I give the understanding by which they can come to Me.
BG 10.11: To show them special mercy, I, dwelling in their hearts, destroy with the shining lamp of knowledge the darkness born of ignorance.
BG 18.65: Always think of Me, become My devotee, worship Me and offer your homage unto Me. Thus you will come to Me without fail. I promise you this because you are My very dear friend.
BG 18.66: Abandon all varieties of religion and just surrender unto Me. I shall deliver you from all sinful reactions. Do not fear.
BG 18.68: For one who explains this supreme secret to the devotees, pure devotional service is guaranteed, and at the end he will come back to Me.
BG 18.69: There is no servant in this world more dear to Me than he, nor will there ever be one more dear.
For the Sanskrit verses or for Prahbupada's purports to the verses, you can find either at vedabase.net/bg