It was only after I was well into adulthood that I heard this saying. It came from a client of the generation ahead of me, and we must have been talking about getting things done. I have long forgotten the details of the conversation, other than the saying itself and the click of the light bulb turning on in my brain.
Here is blog post that discusses this adage in a helpful way.
The matter of not rushing things has been the subject of previous posts of mine recently (here and here) as I have been reading from the Adages of Erasmus.