Why is the earth-world considered more significant than heaven for attaining fearlessness?

The text argues that the earth-world is of profound importance, surpassing even heavenly realms. As Chapter 37 explains, one eventually falls from heaven after their merit is exhausted, making it a temporary state. The earth-world, however, is the unique place where one can practice the science of the oneness of Brahman and the Self, which is the means to ultimate liberation and true fearlessness. Even though life on earth is fleeting, one who offers every action to God here can attain the place of fearlessness. This makes the earth-world the superior ground for spiritual attainment.