"Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered."
Is this about speaking in tongues. I would apreciate your comments
It certainly is a reference to praying in tongues, as is the Spirit's "abba father" cry referred to in vv14-15. As often, the same phenomena/thing is referred to / described in various ways in scripture to bring out different aspects. Be warned,
only the do-ers will understand (John 7:17) and be able the put the full picture together, write books and make all kinds of arguments.
Back to v26
"we" don't know . . . but The Spirit does! He is God, he has all wisdom & understanding, he has the words, we don't.
That's why all got the ability when they received Him - God wants to give his love, joy & peace
that pass our understanding to all his children!
We earnestly desire (inwardly groan for) these things.
If not sure, look also at the fruit ... those like Paul that pray in tongues have flowing fruit of God in their lives, those that don't have religious works, words & arguments.
How do these people pray in the Spirit?
Paul further explains in 1 Cor. 14v14 that when he does his understanding is unfruitful, i.e. if you understand what you are saying, it's not praying in the Spirit.