I have never heard this quote being attributed to Einstein. DuckDuckGo can't find the quote in the first place; Google does yield a few results and yes, one or two websites indeed attribute the quote to Einstein, but others attribute it to other people.
In any case, are you sure you're not thinking of the much more famous quote
> Everything should be made as simple as possible, but not simpler
which is also wrongly(?, [0]) attributed to Einstein?
In any case, are you sure you're not thinking of the much more famous quote
> Everything should be made as simple as possible, but not simpler
which is also wrongly(?, [0]) attributed to Einstein?
[0]: https://skeptics.stackexchange.com/questions/34599/did-alber...