Engage in one kind of business only, and stick to it faithfully until you succeed, or until your experience
shows that you should abandon it. A constant hammering on one nail will generally drive it home at last, so
that it can be clinched. When a man's undivided attention is centered on one object, his mind will constantly
be suggesting improvements of value, which would escape him if his brain was occupied by a dozen different
subjects at once. Many a fortune has slipped through a man's fingers because he was engaged in too many
occupations at a time. There is good sense in the old caution against having too many irons in the fire at once. - P.T. Barnum
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