So next time you're in doubt about whether or not to make it to minyan, go for it, only good will come of it. Take His word for it.
I've personally known this to be true for at least eight years. Every time I would skimp on a tefillah to save time, I'd always end up sitting in traffic or the meeting/appointment I was rushing to would be cancelled. Now I'm happy I found the source in Chazal. Baruch SheKivanti.