Worth doing badly
If a thing is worth doing, it is worth doing badly.
G.K. Chesterton, What's Wrong With the World
This is what Chesterton calls “the democratic faith: that the most terribly important things must be left to ordinary men themselves – the mating of the sexes, the rearing of the young, the laws of the state.”
He is defending the generalist and the amateur - someone who does something for love - versus the professional.
The line became famously attached to him in his lifetime, and he seemed to know it was a bit cheeseball.