When once thy day shall burst to flower, When once the sun shall climb the sky, And busy hour by busy hour, The urgent noontide draws anigh...

The lines use the unfolding of a day—dawn “burst[ing] to flower,” the sun climbing, and “busy hour by busy hour” pressing toward noon—as a metaphor for the quickening pace of life once one’s active period begins. The imagery suggests a transition from quiet potential to demanding immediacy: as daylight strengthens, obligations multiply and time feels increasingly urgent. The tone is gently admonitory, implying that early moments (like morning) are precious because later hours arrive with pressure and momentum. Read this way, the passage participates in a common moral-poetic tradition that treats the day’s arc as a model for human conduct, urging attentiveness before the “noontide” of full activity and responsibility.