Because the way that God communicates with each of us is often different—in fact it’s supposed to be unique and a private experience of the gift of God to you—let me answer the question this way:
If God long ago bore all of your iniquities and failures, and ransomed you from sin (according to Isaiah), if He stepped into the human real estate market and bought and paid for you, making you His own home, His perfect dwelling place (according to Matthew), if He secured you for heaven and forever life with Him, and if He rescued you from this present evil age by putting you into Jesus Christ, where you have all things (according to Paul), if that has all been done, then you’ll be able to discern the voice of the Liar whenever you hear anything different, anything contrary, even if it comes from someone you might otherwise believe.
Knowing the truth of what God did through the cross and resurrection for you will help you, even cause you to expect to hear and know from God directly the truth of what makes Him so happy about you. He’s not quiet about it! He has made you nearly ridiculously well off with Him, and He loves to convey that to you. It’s His favorite thing!
This will also help you to hear and know God’s voice, words and thoughts of truth, freedom, love, correction, direction and encouragement—right to your heart, where it counts. It will sound and be like you’d think Jesus would sound and be, looking right at you, right into your eyes, since He knows all about what He has loved doing for you, as well as what’s to come for the two of you together.
Can you grow in knowing the voice and thoughts of God for you? Yes. In addition to collecting and thinking about the foundational truths of the gospel (some of which are mentioned above), I encourage you to ask God if you might send something along those lines to a friend; to ask Him if one of those truths is especially important for you today; to ask Him if there’s something He wants to show you about how a lie has hindered you or someone you know; to ask and listen, ask and listen, ask and listen again. You might write down some of what you hear and know. Making mistakes is normal—okay? I’ve made a bunch, and God didn’t beat me up about it, right? Fortunately, I make far fewer now.
Becoming familiar with the Truth is like opening a doorway to Jesus and His involvement with you. What’s better than that? After all, He doesn’t just tell you about the way, the truth and the life—He is the way, truth and life. There is, however, something that will become increasingly bothersome as you go forward; lies and half-truths will be to you like fingernails on a chalkboard and torture you inside. It won’t be comfortable. That, too, will work together as a good thing since you will give your attention to the Spirit in order to see if there’s anything for you to do about it with Him.
And that’s when your days become what He intended: a set up for you to know Him. His is the voice you will know. His are the thoughts you will recognize. He will see to it with you—He’s rather fond of you! Count on it.