"closely examined their own hearts, they would have discovered that selfishness was the true reason why they brought no freewill offering to God. Some will always remain in debt. Because of their covetousness, the prospering hand of God will not be with them to bless their undertakings. They love this world better than they love the truth. They are not being fitted up and made ready for the kingdom of God. 1T 225.1"
"For where your treasure is, there will your heart be also."
The EGW passage directly illustrates the principle stated in Matthew 6:21. Where one's treasure (in this case, selfishness and worldly possessions) is, there the heart will be also, preventing freewill offerings and spiritual growth.
"Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him."
Both passages address the conflict between loving the world and loving God. EGW's statement that 'They love this world better than they love the truth' directly echoes the sentiment of 1 John 2:15.
"No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon."
Both passages discuss the impossibility of serving two masters, God and something else (mammon/the world). EGW's passage implies this conflict through the statement that they are not being fitted for the kingdom of God because they love the world.