"Let us remember that we are all members of God's family; and let us remember, too, that Satan and all his host are seeking constantly to force us into making mistakes, that our confidence in ourselves and in others may be destroyed. But when perplexities arise, shall we sit down on the stool of ignorance, and do nothing? God forbid. CT 316.1"
"Now ye are the body of Christ, and members in particular."
Both passages refer to the idea of being members of a body (Christ's body or God's family). While the EGW passage adds the element of Satan's influence, the underlying concept of belonging to a larger group is present in both.
"If, after carrying on manual training for one year, the managers of the school find that there has been a loss, let them seek to discover the reason for this, and guard against it in the future. But let not the spirit of censure prevail, for the Spirit of Christ is grieved when words of unkind criticism are spoken to those who have done their best. In the word of God there is encouragement as well as caution. God forbid that the hands of those who are trying to carry forward this line of work should be weakened. CT 316.3"
"And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption."
The EGW passage directly mentions grieving the Spirit of Christ, which is a clear allusion to Ephesians 4:30, which speaks of grieving the Holy Spirit of God.