My first BJJ coach responded "There's no such thing as no-gi jiu-jitsu, once you take off the gi it's submission wrestling" to someone asking if we were doing gi or no-gi that day (the school was pretty flexible and only had 15-30 students.) My far more popular coach also said something I found interesting "Fuck all that De La Riva, Rubberguard, Spider Guard. There's two guards, and either your guard is open or closed." While somewhat controversial I think they ring true for the most part. The second quote is also better if read with a thick brazillian accent.