"Likewise the Spirit also helps in our weaknesses. For we do not know what we should pray for as we ought, but the Spirit Himself makes intercession for us with groanings which cannot be uttered. Now He who searches the hearts knows what the mind of the Spirit is, because He makes intercession for the saints according to the will of God. And we know that all things work together for good to those who love God, to those who are the called according to His purpose." (Ro.8:26-28, NKJV)
Has there ever been a time when you just felt a great urge to pray, but didn't know how to express it, or as strange as it may sound, what to even express? I can remember a few times, when I just lifted up a grunt, or groan toward the Lord, because the pain & confusion was just too heavy & thick to say anything. I have a strong suspicion that I am not the only one. Well, one of the many benefits (Ps.103:1-5) of being a child of God is that this is enough, when we just cannot express our prayer needs. Our Father knows our needs, & our hearts. He also knows how to supply those needs in such a way that we'll receive them.
I used to think that verse 28 was a new thought after the verses before it, but they are perfectly interrelated! God knows that sometimes it is only severe trials & testings that will get us on our knees so to speak, & it is then that He can use those hard things He lovingly allows into our lives to all work together for good! Not that they are good, but they work together for our good!
Notice however this only works for those called by Him & who love Him. This of course are His children in fellowship with Him! All can be His children if they'll just trust in Christ as Savior, then this magnificent promise is good for you as well! I trust the Lord will use His precious Word in your life today!