Prayer does not need to be eloquent

Sometimes I think that a prayer has to be eloquent, or at the very least specific and concrete. I have the idea that such a prayer will be more effective, but it is that true? 

From Matthew 6, as Jesus is teaching his disciples how to pray.

Your Father knows exactly what you need before you ask him. (NLT)
This is your Father you are dealing with, and he knows better than you what you need. With a God like this loving you, you can pray very simply. (Message)

Thinking about prayer as a conversation between a father and a child makes it clear why eloquence is not necessary. Does a father listen to a child because the child is eloquent? Does a father listen to a child because the child is specific? No, a father listens to a child because the child is dear to him. 

Something I notice in my heart is that I avoid prayer sometimes because I don't have time to be eloquent and specific. I don't have time to organize my thoughts, but I don't want to just read through a list of names. 

Any time prayer becomes boring, it's worth asking whether we are praying rightly. The above passage encourages me that I can pray for someone both simply, passionately, and sincerely now, and I don't have to wait until I figure out exactly what they need, or the best way to organize it.

I can just say, "Father I pray for my sister. You know what she needs. I know she needs your help. You are able to help, and you are so full of graciousness and generosity towards all of us. Help her."