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Difficulties, inharmonies, obstacles, indicate that we are either refusing to give out what we no longer need, or refusing to accept what we require. Growth is attained through an exchange of the old for the new, of the good for the better; it is a conditional or reciprocal action, for each of us is a complete thought entity and the completeness makes it possible for us to receive only as we give. We cannot obtain what we lack if we tanaciously cling to what we have.

— Master Key System (1919) by Charles F. Haanel (1866-1949)