“You’ve got to develop mental strength. And you develop mental strength with the will. The will is the mental faculty that gives you the ability to hold one idea under the screen of your mind to the exclusion of all outside distractions.” – a quote by whom?
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"You've got to develop mental strength. And you develop mental strength with the will. The will is the mental faculty that gives you the ability to hold one idea under the screen of your mind to the exclusion of all outside distractions." - a quote by Bob Proctor.