"All this is harming your own soul; for every word of doubt you utter is inviting Satan's temptations; it is strengthening in you the tendency to doubt, and it is grieving from you the ministering angels. When Satan tempts you, breathe not a word of doubt or darkness. If you choose to open the door to his suggestions, your mind will be filled with distrust and rebellious questioning. If you talk out your feelings, every doubt you express not only reacts upon yourself, but it is a seed that will germinate and bear fruit in the life of others, and it may be impossible to counteract the influence of your words. You yourself may be able to recover from the season of temptation and from the snare of Satan, but others who have been swayed by your influence may not be able to escape from the unbelief you have suggested. How important that we speak only those things that will give spiritual strength and life! SC 119.1"
"And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption."
Both passages discuss grieving a spiritual entity. EGW speaks of grieving ministering angels through doubt, while Ephesians speaks of grieving the Holy Spirit. The connection is strong.
"For by thy words thou shalt be justified, and by thy words thou shalt be condemned."
Both passages highlight the power of words to affect one's standing before God. EGW emphasizes the negative impact of doubt, while Matthew speaks of justification or condemnation.
"And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell."
Both passages discuss the destructive power of words, although James 3:6 is more general and forceful, while the EGW passage focuses on doubt and its effects.
"Angels are listening to hear what kind of report you are bearing to the world about your heavenly Master. Let your conversation be of Him who liveth to make intercession for you before the Father. When you take the hand of a friend, let praise to God be on your lips and in your heart. This will attract his thoughts to Jesus. SC 119.2 All have trials; griefs hard to bear, temptations hard to resist. Do not tell your troubles to your fellow mortals, but carry everything to God in prayer. Make it a rule never to utter one word of doubt or discouragement. You can do much to brighten the life of others and strengthen their efforts, by words of hope and holy cheer. SC 119.3"
"Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them."
The EGW passage directly references Jesus' intercession, mirroring the core concept of Hebrews 7:25.
"But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment."
Both passages deal with the importance of the words we speak. Matthew 12:36 warns against idle words, while EGW emphasizes speaking words of hope and praise. While not a direct quote, the theme of accountability for our speech connects them.