Solomon wrote: “If an iron tool has become blunt and someone has not whetted its edge, then he will exert his own vital energies. ”
त्याचप्रकारे, तितकाच वेळ अभ्यास करूनही दोन व्यक्‍तींना त्यापासून मिळणारा लाभ वेगवेगळा असू शकतो.