And the Scripture clearly tells us to evaluate and judge prophecy. The best standard for doing that is not how it makes us feel, but the objective standard of the Scripture itself.
BINGO! Scripture is the bottom line. Apparently even EGW says the same.
Two things are evident though regarding prophets. Number one, they are human beings, and therefore not perfect. They themselves must be corrected on occasion, and do not always even correctly understand, or understand at all what God has revealed to them through vision, or what ever means He chooses. They must learn at the feet of Jesus just like everyone else.
Just because they are prophets, doesn't mean that every word that ever comes out of their mouths, comes directly from God either. God does not give them total insight regarding all things, and they have opinions just like everyone else. Add to this the fact that others are likely to take their words, and twist or mutilate them, just like many do with the scriptures, then your statement above becomes all the more important. The scriptures are the bottom line.
Lets face it, in this world, a true prophet will suffer persecution, false accusations, misrepresentation, and condemnation by the majority. This is what happened to all the biblical prophets, Apostles, and even Jesus Christ Himself. Therefore, the bible must be the bottom line for determining the authenticity of anyone claiming to be a prophet. There are many books written about EGW, and others attacking or defending the same. Simply choosing to read one or the other, is choosing to believe what someone else has to say about the subject. If we want to judge wether a person is a prophet or not, we should examine their writings ourelves, and compare them with scripture.
On the other hand, we could just immerse ourselves in the word of God seeking the guidance of the Holy Spirit concerning the same. If we do this, we can't go wrong. The scripture is clear.
2 Tim 3:14 But continue thou in the things which thou hast learned and hast been assured of, knowing of whom thou hast learned them; 15 And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus. 16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: 17 That the man of God may be perfect, throughly furnished unto all good works.
Heb 4:12 For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
13 Neither is there any creature that is not manifest in his sight: but all things are naked and opened unto the eyes of him with whom we have to do.
Matt 4:4 But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.