"I am aware that, in examining any proposition, the object or tendency of which is to introduce change of any description in the constitutions of human society, there are two general considerations, clashing very much with each other, which naturally present themselves to every reflecting mind. The one, the most extensive, perhaps the most popular, is the dread of innovation; the other, the expediency of timely reformation or concession. In reconciling these opposite and conflicting principles, and in assigning to each its due weight in human affairs, consists almost the whole art of practical policy."