I’ve heard that sometimes when you can’t find the words to pray, you can borrow the words from someone else. That’s one of the main reasons that I’m a fan of prayer books and liturgies. It helps to be able to pray the words of saints who have gone before and walked the same road that we’re walking now. It helps to hear your own thoughts and desires expressed for you better than you could ever have said it yourself.
Best of all, even when there are absolutely no words at all — only tears and sighs and groans — the Father knows because the Spirit of God translates those longings too deep for words into psalms and hymns to God. You are always heard.