"Some of our brethren had had long experience in the truth and for years had been acquainted with me and my work. They had proved the truthfulness of the Testimonies and had asserted their belief in them. They had felt the powerful influence of the Spirit of God resting upon them to witness to their truthfulness. I was shown that if such, when reproved through the Testimonies , should rise up against them and work secretly to lessen their influence, they should be faithfully dealt with; for their course would endanger those who were lacking in experience. [ Testimonies for the Church 1:382 .] 5T 669.1"
"For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,"
Both passages address the serious consequences of rejecting truth after having received knowledge and experience of it. The EGW passage focuses on those who undermine the testimonies after claiming to believe them, while Hebrews 10:26 warns against willful sin after receiving knowledge of the truth.
"The first number of the Testimonies ever published contains a warning against the injudicious use of the light which is thus given to God's people. [ Testimonies for the Church 1:119 .] I stated that some had taken an unwise course; when they had talked their faith to unbelievers, and the proof had been asked for, they had read from my writings instead of going to the Bible for proof. It was shown me that this course was inconsistent and would prejudice unbelievers against the truth. The Testimonies can have no weight with those who know nothing of their spirit. They should not be referred to in such cases. 5T 669.2"
"But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned."
Both passages highlight the idea that spiritual truths are not readily understood or accepted by those who are not spiritually minded. The EGW passage explains why the testimonies should not be used as primary evidence with unbelievers, while 1 Corinthians 2:14 explains why the 'natural man' cannot understand spiritual things.
"“Some of the preachers are far behind. They profess to believe the testimony borne, and some do harm by making them an iron rule for those who have had no experience in reference to them, but they fail to carry them out themselves. They have had repeated testimonies which they have utterly disregarded. The course of such is not consistent.” [ Testimonies for the Church 1:369 (1863) .] 5T 669.4"
"All therefore whatsoever they bid you observe, that observe and do; but do not ye after their works: for they say, and do not."
Both passages address the hypocrisy of leaders who profess to believe or teach certain principles but fail to live by them themselves. The EGW passage criticizes preachers who inconsistently apply the testimonies, while Matthew 23:3 warns against following the example of those who 'say, and do not'.