In Attar's 'Conference of the Birds', within the 'Discourse of Yusuf of Hamadan on the World of Existence', the endless nature of the spiritual journey is profoundly emphasized. Yusuf of Hamadan teaches that the entirety of creation—past, present, and future—is merely a single drop in the infinite ocean of existence. He asserts that no seeker has ever reached the end of this path or found a cure for the pain of seeking, illustrating the immense scale of the spiritual quest and the relative insignificance of the material world.