In the same way, the Spirit helps us in our weakness. We do not know what we ought to pray for, but the Spirit himself intercedes for us with groans that words cannot express. And he who searches our hearts knows the mind of the Spirit, because the Spirit intercedes for the saints in accordance with God's will. . . . Christ Jesus, who died - more than that, who was raised to life - is at the right hand of God and is also interceding for us. (Rom. 8:26-27, 34)
There are times in our lives when we are temporarily incapable of speaking. We're speechless. Maybe God has "WOWED" us with an answer to prayer and at the realization of what He did we find ourselves to be speechless. Or maybe we've been rendered speechless by shock or fear. Grief and loss can also make us unable or unwilling to speak.
Sometimes we can even be speechless when we're praying. We often don't know what exactly we should be praying for. We don't know what is best for us and we don't know what the future holds. We know in our hearts that we have questions, burdens, and heartaches for ourselves and our loved ones that are not capable of being expressed in words. But that's okay because even though we are speechless the Holy Spirit within us and Jesus in Heaven are effectively communicating with God on our behalf. Take encouragement from these verses in Romans and be assured that when you're prayers are speechless just the right words are always being prayed for you.
O God, too weak and worn for words, I shrink From trials that deeply wound, and yet to think Your Holy Spirit helps me as I pray And gives a voice to what I cannot say! -Gustafson