It is the ancient teaching of sages and scriptures that our mental state at the time of death determines our next birth. If at the time of death, we fully surrender to the Lord, the Universal Being, then we merge in God and are freed from all sorrows.
We usually think of that at the time of death what we have loved and thought about during life. Hence the purest souls who have devoted their whole life to serving the God of Love merge in that Universal Love immediately at the time of death and achieve complete liberation.
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