Having assimilated all joyful and sorrowful experiences, the speaker now feels that the entire world has become their heart and soul. They perceive a deep, personal connection with the whole world.

This couplet beautifully expresses a profound truth. It says that once you've truly experienced and processed all the joys and sorrows that life throws your way, something remarkable happens. You start seeing the entire world not as something separate, but as an extension of your very own being. Every person, every experience, every corner of the world begins to feel like your own heart, your own soul. It's about achieving a state of deep connection, understanding, and universal love, where the boundaries between you and the world dissolve, leading to immense empathy and acceptance for everything.