1 Sam 3:8-12 says
Then Eli perceived that the Lord had called the boy. Therefore Eli said to Samuel, “Go, lie down; and it shall be, if He calls you, that you must say, ‘Speak, Lord, for Your servant hears.'” So Samuel went and lay down in his place.
Now the Lord came and stood and called as at other times, “Samuel! Samuel!”
And Samuel answered, “Speak, for Your servant hears.”
Then the Lord said to Samuel: “Behold, I will do something in Israel at which both ears of everyone who hears it will tingle. Today, the Lord is calling peoples’ name. When you hear his voice, respond, for that is all He desires. A relationship, a person to walk with. This was His original plan from the foundation of the earth. Lets make it ours as well. Take the invitation. Walk with Him today.