Romans 8:24-26

For in this hope we were saved [by faith]. But hope [the object of] which is seen is not hope. For who hopes for what he already sees? But if we hope for what we do not see, we wait eagerly for it with patience and composure. In the same way the Spirit [comes to us and] helps us in our weakness. We do not know what prayer to offer or how to offer it as we should, but the Spirit Himself [knows our need and at the right time] intercedes on our behalf with sighs and groanings too deep for words.