Torah is like rain

(יערוף כמטר לקחי (לב:ב
Let my instruction flow like rainfall (32:2)

The words of the Torah (דברי תורה) are just like the rain. The same way we dont see the benefits of the rain immediately and the rain can sometimes be viewed as an inconvenience, so too with the words of the Torah, we do not see their influence immediately but in the end we absorb them like thirsty soil (Rabbi Simcha Bunim Bonhart of Peshischa- רבי בונם מפשיסחה).