The old saying goes 'no one has a thousand lucky days, no flower blooms red for a hundred' - leave yourself a way out.
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history
Popular proverb from Yuan/Ming drama, notably 《元曲选》 and 水浒传-era popular literature. Full form: 人无千日好，花无百日红 a folk-level counterpart to Confucian sayings, warning against taking good times for granted.
usage
Virtually always quoted together with 花无百日红. Colloquial, very common in spoken Mandarin; unlike many classical lines, this one still lives in everyday speech.
