The eighth chapter of the Bhagavad Gita is Akshara Brahma Yoga. In this chapter, Krishna reveals the importance of the last thought before death. If we can remember Krishna at the time of death, we will certainly attain him. Thus, it is very important to be in constant awareness of the Lord at all times, thinking of Him and chanting His names at all times. By perfectly absorbing their mind in Him through constant devotion, one can go beyond this material existence to Lord's Supreme abode.
O son of Prtha, after being born again and again, that very multitude of beings disappears in spite of itself at the approach of night. It comes to life at the approach of day.OPEN VERSE
But distinct from that Unmanifested is the other eternal unmainfest Reality, who does not get destroyed when all beings get destroyed.OPEN VERSE
He who has been mentioned as the Unmanifested, the Immutable, they call Him the supreme Goal. That is the supreme abode of Mine, reaching which they do not return.OPEN VERSE
O son of Prtha, that supreme Person-in whom are included (all) the beings and by whom all this is pervaded-is, indeed, reached through one-pointed devotion.OPEN VERSE
O best of the Bharata dynasty, I shall now speak of that time by departing at which the yogis attain the State of Non-return, and also (of the time by departing at which they attain) the State of Return.OPEN VERSE