Sai mentions that the earth-world is more important than heaven. How does this idea help in dealing with the fear of death?

Chapter 37 explains that one eventually falls from heaven after their merit is exhausted, making it a temporary state. In contrast, the earth-world is of profound importance. Though life on earth may be fleeting, it is the unique place where one can attain the science of the oneness of Brahman and the Self, which is the means to ultimate liberation. By offering every action performed in a moment to God, a person can attain the place of fearlessness. This perspective shifts the focus from fearing death to utilizing this earthly life for ultimate spiritual attainment.