The speaker has sustained themselves from the essence or presence of their beloved, whose 'name' is like a flowing river. They are expressing the story of their love, encompassing both happiness and pain, which is so profound that it transcends verbal description.

This couplet beautifully expresses a deep, all-encompassing love. The poet suggests that the very essence or identity of their beloved is like a life-giving river, and they have wholeheartedly partaken in this source of sustenance. It's as if their existence is intertwined with the beloved's. Following this profound connection, the poet then speaks of their shared journey of love. They reveal that through their words, they are recounting the entire spectrum of this relationship – embracing both its joyous moments and its painful experiences. It's a complete narration of a love that has been both a source of life and a journey of varied emotions.