 His intercession for us is beyond our ability to comprehend or understand. It's through groanings which cannot be uttered. Which means they're inexpressible through words. They're inaudible. We don't hear them. And we can't fully understand them. They are incomprehensible. This is not referring to the gibberish tongues of Charismaniacs. It's not what it's referring to. It's referring to the intercession of the Holy Spirit for His own. And it's the Spirit who sustains us, aids us, helps us, and preserves us all the way to our glorification.