“Abiding happiness is not simply a possibility, but a duty; that all may live above the troubles of life; that worry is a poison and happiness a medicine.”
Quote by Newell Dwight Hillis
Author
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“The remarkable thing about the human mind is its range of limitations.”
Source: The decline and fall of science
“The only thing over which you have complete right of control at all times is your mental attitude.”
Source: Napoleon Hill's Keys to Success: The 17 Principles of Personal Achievement
