"At FoundationDB, once we hit the point of having ~zero bugs and confidence that any new ones would be found immediately, we entered into this blessed condition and we flew. Programming in this state is like living life surrounded by a force field that protects you from all harm. Suddenly, you feel like you can take risks"

When this state hits it really is a thing to behold. Its very empowering to trust your system to this extent, and to know if you introduce a bug a test will save you.