And from this the practical deduction is--tolerance. Let no man think that he has any argumentative right to expect that the mere subjective habit or tone of his own mind should exert any influence on that of his fellow; but rather let him always remember that the only legitimate weapons of his intellectual warfare are those the _material_ of which is derived from the external world, and only the _form_ of which is due to the forging process of his own mind. And if in battle such weapons seem to be unduly blunted on the hardened armoury of traditional beliefs, or on the no less hardened armoury of confirmed scepticism, let him remember further that he must not too confidently infer that the fault does not lie in the character of his own weapons. To drop the figure, let none of us forget in how much need we all stand of this caution:--Knowing how greatly the value of arguments is affected, even to the most impartial among us, by the frame of mind in which we regard them, let all of us be jealously careful not to over-estimate the certainty that our frame or habit of mind is actually superior to that of our neighbour. And, in conclusion, it is surely needless to insist on the yet greater need there is for most of us to bear in mind this further caution:--Knowing with what great subjective opposition arguments are met when they conflict with our established modes of thought, let us all be jealously careful to guard the sanctuary of our judgment from the polluting tyranny of habit. * * * * * CHAPTER VII. GENERAL SUMMARY AND CONCLUSIONS.