The last word of the proverb, ‘All good things must come to an ____.’

পুরো বাক্যটা হবে - All good things must come to an end.
Meaning: A further difficulty or annoyance, typically minor in itself but coming on top of a series of difficulties, that makes a situation unbearable. / Said when you accept that even enjoyable experiences cannot last forever.
Ex: It's been a fantastic couple of weeks but all good things must come to an end.

Source: Cambridge and Oxford Dictionary.