It would be difficult to overstate the importance of Jack to we Australians.
He was the personification of us in the 60s and will always remain a larger-than-life figure to us. Alan Jones inherited his mantle but, truth be told, was one-dimensional whereas Jack was multi-talented. Jack was not only a brilliant and tough driver, as was Jones, but was an astute manager and engineer. The most remarkable thing is that, in the latter capacity, he didn't let his ego preclude his recognizing that designing a competitive car while still driving was beyond even his prodigious abilities, (a realization that has escaped several other driver/team owners) so he hired Ron Tauranac to design the cars while Jack concentrated on the driving.. It was a match made in heaven.
Rest well, Jack. We Australians will always be grateful that you were one of us.