[iamwil]

A related mantra is to "Make impossible states impossible" https://www.youtube.com/watch?v=IcgmSRJHu_8

[nathcd]

I think the original formulation is "make illegal states unrepresentable" from Yaron Minsky: https://blog.janestreet.com/effective-ml/ and https://blog.janestreet.com/effective-ml-revisited/ (or maybe there are older sources than 2010?)