"Some have no firmness of character. Their plans and purposes have no definite form and consistency. They are of but little practical use in the world. This weakness, indecision, and inefficiency should be overcome. There is in true Christian character an indomitableness that cannot be moulded or subdued by adverse circumstances. We must have moral backbone, an integrity that cannot be flattered, bribed, or terrified. GW 290.4 God desires us to make use of every opportunity for securing a preparation for His work. He expects us to put all our energies into its performance, and to keep our hearts alive to its sacredness and its fearful responsibilities. GW 291.1"
"A double minded man is unstable in all his ways."
Both passages address the issue of instability and lack of firmness in character. James 1:8 speaks of a 'double minded man' being unstable, while the EGW passage describes those lacking firmness and consistency. The connection is valid and meaningful.
"That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive;"
Both passages address the issue of being easily swayed and lacking a firm foundation. Ephesians 4:14 speaks of being 'tossed to and fro' by false teachings, while the EGW passage describes a lack of firmness and consistency. The connection is valid.
"Many who are qualified to do excellent work accomplish little because they attempt little. Thousands pass through life as if they had no great object for which to live, no high standard to reach. One reason for this is the low estimate which they place upon themselves. Christ paid an infinite price for us, and according to the price paid He desires us to value ourselves. GW 291.2"
"For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God’s."
The EGW passage directly echoes the principle in 1 Corinthians 6:20. Both emphasize that because Christ paid a price for us, we should value ourselves and glorify God. The connection is clear and significant.