The world is full of all sorts of voices. Some good, some bad, some neutral.
The voice of God trumps all. There is safety & assurance in listening to it.
Joshua 1:8 (KJV) This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.