"Much hard labor is often expended that is not called for and that will never be appreciated. If those who have large concentrativeness cultivate this faculty to the neglect of others, they cannot have well-proportioned minds. They are like machinery in which only one set of wheels works at a time. While some wheels are rusting from inaction, others are wearing from constant use. Men who cultivate one or two faculties, and do not exercise all equally, cannot accomplish one half the good in the world that God designed they should. They are one-sided men; only half of the power that God has given them is put to use, while the other half is rusting with inaction. 3T 35.1"
"But now hath God set the members every one of them in the body, as it hath pleased him."
This verse speaks to God setting every member in the body as it has pleased him, suggesting that each person has a unique role and purpose, and that neglecting certain faculties hinders the fulfillment of that purpose.