A young man lies on a flowery riverbank, and what happens next is very small and very quiet. The river presses against his hand "like a small request," as if the water is gently asking for something. The poem never says what, but the rest of the scene suggests it wants him to let go.
The river is described as carrying "her feeling" without reflection. It simply feels and flows, never stopping to think about itself. Around it, the world is hushed: one bird passes silently, and snow falls from the old forest. Nothing hurries or speaks.
In the last lines, the young man's hand "goes away" with the river to a place where feeling and reflection are one. That seems to be what the poem longs for: a moment when we stop standing apart from our emotions and analysing them, and simply merge with them. The mood is calm, dreamy, and slightly wistful.