A Lutheran on the Trinity

Hans Fiene is a Lutheran pastor in Illinois. I am disappointed with his anti-Mormon tendencies but I appreciate his thoughtfulness. In this video, however, he makes a point that I have often heard my friend, Lou Midgley, make:

You cannot make a popular explanation of the Christian Trinity of the creeds without falling into heresy. 

From my perspective, the formulations of the creeds tend to be incoherent gibberish, and I appreciate a good Lutheran pastor being able to articulate this. Perhaps there is some common ground we can build on.