wer rastet, der rostet
proverb
you snooze, you lose: if one becomes inactive, lazy or left behind once, then one will find it all the more difficult to become active, productive or progressive again
wer rastet, der rostet is a German proverb meaning “you snooze, you lose: if one becomes inactive, lazy or left behind once, then one will find it all the more difficult to become active, productive or progressive again”.