Nor is moderation the remedy for all evils. There are in us tendencies to feel and act which survive from times when the mere preservation of individual and of race was desirable quite unconditionally; but which, in our altered conditions, require not moderating, but actually replacing by something more discriminating, less wasteful and mischievous. Vanity, for instance, covetousness, ferocity, are surely destined to be evolved away, the useful work they once accomplished being gradually performed by instincts of more recent growth which spoil less in the process.