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preach because you have it."^[1] Errors, when useful to life, may in time become incorporated in the living organism and act as impulses there.^[2] Yet errors are errors, whatever their effect, whatever their beneficence. The question of the usefulness of an idea is separate from that of its truth.^[3] Not only does the agreeableness or comfort of an opinion prove nothing, its necessity to life proves nothing—among the conditions of life, error may be one.^[4]

1. Dawn of Day, § 325.
2. Werke, XI, 425-6.
3. Human, etc., §§ 30, 36.
4. Ibid., §§ 120, 131, 161, 36, 635 (the inspiring and invigorating not thereby true), Dawn of Day, §§ 90, 424, 73, Joyful Science, § 121.