The ability to maximize a car's performance within a ubiquitously hazardous context like the Singapore track is what separates the Vettel's of the world from the rest. (Well, that and we're not all built like jockeys.)
It's hard to convey to those unfamiliar with performance driving the difficulty of what's occurring here. To avoid the walls while driving an F1 car at 10/10ths, and to within hundredths of a second of the car's full potential is very nearly superhuman. Enjoy the ride.