In First Samuel Chapter three God called Samuel by name in the night. Three times the boy thought is was the High Priest Eli and went to answer him. After the third time that Samuel awakened Eli he told him that it may be God calling so Samuel should respond accordingly.
Samuel heard the call a fourth time and he answered, “Speak for your servant is listening.” After that God revealed him self and Samuel knew the voice of God. How often do we hear the voice of God and do not pay attention because recognize who is calling us?