«وَأَسْتَسْقِي الْوَبْلَ وَالطَّلَّ»
And I would seek both the downpour and the drizzle.
Wabl denotes heavy rain; ṭall is a light sprinkling or drizzle. Weather is not the literal subject. Rain stands for learning obtained in greater or smaller quantities.
One encounter brings substantial insight, another only a useful point. The narrator values both, and the metaphorical contrast reveals the breadth of his eagerness.