The teacher appeared at my most confused moment — truly like a good rain that knows its season.
Tips
history
Opening line of Du Fu 杜甫's 《春夜喜雨》 (Tang): ‘好雨知时节，当春乃发生。随风潜入夜，润物细无声。’ (The good rain knows its season, arriving when spring comes; it slips into the night on the wind, moistening all things silently.) Written in Chengdu during a calm, fruitful period of Du Fu's life.
usage
Commonly used figuratively for any well-timed help, policy, or arrival. 时节 = season / the right moment.
