When does the Spirit do this?
In our times of weakness when we do not know how to pray as we should
2 Corinthians 12:3-9 - Paul is an example of not always knowing how best to pray
How does the Spirit do this?
With groanings too deep for words
This is not “speaking in tongues or some heavenly language as there are no words being uttered aloud
Why does the Spirit do this?
Because He knows what the will of God is for our lives
The Spirit knows the thoughts of God (1 Corinthians 2:11)