"In conclusion, the basic principles of a liberal society may be summed up by saying that in such a society all coercive functions of government must be guided by the overruling importance of what I like to call . Their achievement requires that in its coercive functions government shall be confined to the enforcement of such prohibitions (stated as abstract rules) as can be equally applied to all, and to exacting under the same uniform rules from all a share of the costs of the other, non-coercive services it may decide to render to the citizens with the material and personal means thereby placed at its disposal."