The IF....then statmen in Access VBA

I am testing my understanding on the if then statement, I wrote a little thing down below but when I hit run, nothing happened. I was expecting a msgbox will appear asking me if I want to quit or not and giving me choices to choose. Did I miss anything please. Thanks

Sub testifthenelse(bQuit As Boolean)
Dim s As String
s = "Do you want to quit?"
If MsgBox(s, vbYesNo, "Quite?") = vbYes Then
bQuit = True
Else
bQuit = False
End If
End Sub