আঘাত সে যে পরশ তব, সেই তো পুরস্কার।

The line “আঘাত সে যে পরশ তব, সেই তো পুরস্কার” was written by Rabindranath Tagore.

It is a classic example of his profound, devotional, and tender poetic style, where pain itself becomes a blessing when it comes from the beloved (often referring to the Divine).