I like that everybody is speaking against the term "feeling". Though physically the world might say that we are just having a gut feeling, because there is nothing else in this realm to discribe it. People who have heard God speaking to them know that it is more then a simple "feeling", when the Holy Spirit comes over you you just know.
Hebrews 11:1 defines faith for us:
Faith is the assurance of things hoped for, and the conviction of things not seen.
Knowing what faith is helps us to undestand how God talks to us. Not only do we need faith to hear what God is saying, but we need faith to acknowledge that He is speaking.
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Take the story of Samuel (1 Samuel 3).
When he was still a young boy he heard a voice calling his name one night. He got up and rushed to his master, but he was told to go back to sleep. It happened two more times that night. Finally, his master was awake enough to see what was happening, and he told Samuel "When you hear that voice again say 'Speak, Lord, for your servant is listening.'"
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Samuel became a very important prophet. He helped establish Jerusalem, he crowned Saul, and blessed King David when he was still a shepard boy. When he died everybody in Israel mourned because they knew God spoke through him.
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While we may never hear a diembodied voice calling our name, I kow that people have heard God calling them to do things they normally wouldn't do. About five years ago I felt God call me to go back to school, at the time I was scared and I didn't have the faith to say "Speak, Lord". But God kept tugging at me, and college information would show up in my mail box, and people would keep telling me I was too smart for fast food and that I shold go back to college, you get the point after a while.