I don't study the Bible, but I came across this timeless wisdom.
And thou shalt take no gift: for the gift blindeth the wise, and perverteth the words of the righteous. Exodus 23:8 — King James Version
In order to give good advice, there must be no "gift" or conflict of interest to blind and pervert the business of giving advice. Lots of blind perversion going today, and for a while now.