This poem means that when spring comes, good rain comes quietly at night with the spring breeze, moistening things silently. Praising the teacher's considerate education for students is subtle and benefits you silently.
Teachers are the closest and most respected people of students and the most direct role models. Students have a natural "learning from teachers". Teachers' humanistic quality, like a spring rain, will "sneak into the night with the wind and moisten things quietly", which will have a subtle influence on students.
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The first couplet and the parallel couplet were written indoors, and the third couplet was written out of court. If it rains so well, I hope it rains enough and stays up all night.
If only for a while, the clouds will disperse, then "moistening things silently" will be very incomplete, and "good things" will not be done to the end. Because the good rain moistens things quietly, the poet can't hear clearly, and he is afraid that the rain will stop, so he goes out to watch.
If it is not too gloomy at night, the path is easier to see than the field, and the river is easier to distinguish than the shore.
Now look around, because of the dark clouds, the road is not clear and the river is foggy. Only the lights on the boat flickered and there was a little light. The poet breathed a sigh of relief: it seems that the rain will definitely continue until dawn.