What can be, unburdened by what has been。
"What has been" 其实就是 "What IS",也就隐约包含了可操作性。"What can be"就是人人平等,天下大同,世界和平这些美好愿景。
按照定义,保守派会更注重 What IS,更注重可操作性; 进步派会更注重 What CAN BE。要 unburdened by 可操作性。