Why wouldn't cruelty also be boundless, when the grace and favor destined to be received was meant to be limitless?

Here, the poet touches upon the bittersweet symmetry of love and destiny. If the beloved's grace and mercy were destined to be limitless, then the trials and heartaches along the path also had to be just as boundless to match that scale. Intense devotion never deals in halves; in this poetic world, immense suffering and immeasurable kindness are simply two sides of the very same coin.