"But a greater danger than this has been revealed to me in the feeling that has been growing among our workers that ministers and other laborers in the cause should depend upon the mind of certain leading workers to define their duties. One man's mind and judgment are not to be considered capable of controlling and molding a conference. The individual and the church have responsibilities of their own. God has given to every man some talent or talents to use and improve. In using these talents he increases his capability to serve. God has given to each individual judgment, and this gift He wants His workers to use and improve. The president of a conference must not consider that his individual judgment is to control the judgment of all. 9T 277.3"
"But the manifestation of the Spirit is given to every man to profit withal."
Both passages emphasize that God gives gifts/talents to each individual for the common good. The EGW passage applies this principle to the context of church leadership and the importance of individual judgment, while 1 Corinthians 12:7 speaks more broadly about the manifestation of the Spirit.
"And unto one he gave five talents, to another two, and to another one; to every man according to his several ability; and straightway took his journey."
The EGW passage explicitly refers to the concept of talents given to each person to use and improve, which is a clear allusion to the Parable of the Talents in Matthew 25:15.