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The jack-of-all-trades seldom is good at any. Concentrate all of your efforts on one definite chief aim.

Napoleon Hill
Inspirational, Success, Effort
Napoleon Hill (2015). “Think and grow rich: Brazilian edition”, p.109, CDG Edições e Publicações LTDA
The jack-of-all-trades seldom is good at any. Concentrate all of your efforts on one definite chief aim.