Why do you have to enter the Isles of the Blest?

In Greek mythology, the Isles of the Blest are a paradise reserved for the souls of heroes and those favored by the gods. Entering these isles represents a reward for a virtuous life and heroic deeds, granting eternal bliss and peace after death. It symbolizes the ultimate achievement of a soul seeking rest and fulfillment after its earthly struggles. Thus, one must enter the Isles of the Blest to attain this ideal state of existence and immortality.