YOUR “Weakness” and not knowing how or what to pray at times, does not nullify the Spirit of God working on your behalf! 
The Holy Spirit…
1. Helps us in Our Weakness- {Rom 8:26}
2. Intercedes for us- {v26}
3. Intercedes for us… “According To The Will Of God!”-{v27}
The Holy Spirit Is Undertaking For You!
“the Spirit also helps our weakness; for we do not know how to pray as we should, but the Spirit Himself intercedes for us with groanings too deep for words; and He who searches the hearts knows what the mind of the Spirit is, because He intercedes for the saints according to the will of God.”-{Rom 8:26-27}