call InvokeRepeating from a static method (C#)

I am trying to optimize my code by "globalizing" functions that do the same thing. However, I've run into a snag that I don't fully understand and I'd like some help in solving it. Take this very basic script: using UnityEngine; using System.Collections; public class TestScript : MonoBehaviour { public void startThisFunction() { InvokeRepeating("doThisFunction", 0.1f, 5.0f); } void doThisFunction() { Debug.Log("Just a simple test"); } public static void startThisFunctionAsStatic() { startThisFunction(); } } It doesn't do anything, it's just for me to try and understand how to do this. If I change "startThisFunction" to a static method, I get an error stating InvokeRepeating requires a reference to it. However, as we all know, you can't reference MonoBehaviour by a "new" call, so how do I do it? I tried adding a calling method "startThisFunctionAsStatic" but this obviously doesn't work so how can I call a non-static MonoBehaviour method from within a static method? I hope I've explained clear enough what I'm after and any help will be greatly appreciated.