Truly a good rain knows its season - this shower arrived right in time for spring planting.
Tips
history
Opening line of 杜甫's 《春夜喜雨》 (Tang): '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 杜甫's life.
usage
Commonly used figuratively for any well-timed help, policy, or arrival. 时节 = season / the right moment.