It was an interesting book, full of fascinating insights into human relationships. What's "insight" in this sentence. Perspective or perception or knowledge?

Reading the first two lines of Goethe’s poem “the cuckoo like the Nightingale”, I can't help but think that "Sad to have chilly spring shut in this lonely place, while the Sun is setting in cuckoo's cries"; also makes people feel the feeling of loneliness that "spring going gone". Of course, it is impossible for Goethe to have read Qin Guan's poems, and at the beginning of Qin's poems: "The towers are lost in the fog, The ferry is obscure under the moon, The peach blossoms are nowhere to find." describes the misty night that completely blocks the way to the quiet road of the peach blossoms, which is very different from the scenery and artistic conception of this poem. Goethe used the sparse branches and leaves which cover the spring scenery on the terrace in summer, insinuating that in a realistic and rational life circle, the road to his orient is cut off, just like "The peach blossoms are nowhere to find."