Successful Life
If at the time of death one can remember Krishna, one’s life is successful.
Srimad Bhagavatam 10.1.5-7,
Srila Prabhupada
Remembering Krishna At The Time of Death
If one doesn't practice remembering Krishna while one is struggling for existence, then it will not be possible for one to remember Krishna at the time of death.
Bhakti Charu Swami on Real Test of Devotion
A devotee knows that even at his death Krishna will protect him. The real test of our devotion will be at that time.
Effect of Chanting
One need only chant the Hare Krishna mahamantra. Everyone engaged in the practice of chanting the Hare Krishna mahamantra will be completely cleansed, from the core of his heart, and be saved from the cycle of birth and death.
Srimad Bhagavatam 7.6.1,
Srila Prabhupada.
Death
Death is not a big thing, what is important is God's service.
Stopping The Repeated Cycles of Birth and Death
One who has taken his birth is sure to die, and after death one is sure to take birth again. Surrender to Holy names of the Lord & stop this cycle of repeated bithe & death.