The "early sobbing of morn" is usually portrayed in poetic language to create a sense of atmosphere, setting the scene for a new day. It could suggest the gentle rustling of leaves, the soft murmur of a river, or the whisper of the wind. These quiet, natural sounds are personified as "sobbing," giving them an emotional quality that echoes the poet's own feelings about the new day or perhaps a sense of renewal.
The phrase captures the beauty and the tranquility of the early morning, often characterized by a sense of stillness, hush, and freshness. The poet's choice of words highlights the subtle sounds and movements that accompany the arrival of dawn, allowing the reader to experience a vivid connection with nature and the transformative power of a new day's beginning.