The Holy Spirit's voice is consistent and firm, unlike human emotions that shift and change. It keeps convicting you even when you try to ignore it. If what you think God is telling you changes with your feelings, that's not God's voice.
God's voice is stable and consistent. Your voice is inconsistent. Your emotions are inconsistent. You see, when we get a thought that we might think is God, we sometimes waver on it. We go back and forth. Or maybe that thought might change in application. Or maybe depending upon how we're feeling, our calling changes. I met a lot of Christians, their calling seems to change every time their emotions change. But no, the voice of the Holy Spirit, It's consistent, firm. There's not confusion to that voice. There is a single truth that is spoken. You might even notice this with the Holy Spirit, to when the Holy Spirit convicts you of something or speaks something to you and you try to ignore that, or you don't like the instruction that you were given, so you try to explain it away. But deep down, there's this persistent speaking coming from the voice of the Holy Spirit. and it pricks the heart and you try to suppress that, but you can't because it's just pervasive and it continues to be firm in its instruction to you. That's the voice of the Holy Spirit. That's one of the principles about the voice of the Holy Spirit. By contrast, your emotions up and down, your thoughts up and down. So if one day God instructs one thing, and then the next day God's instructing something entirely different, and then the next day it goes back to that other thing, that's obviously you, that's not the voice of the Holy Spirit. There's a consistency to the voice of God.
