Everyone knows that person that doesn't seem to open up to you at all but seems to have a heavy heart. They are lost. They need Jesus. They have hurt, pain, and anger in their lives but what is in their hearts is hidden.
As someone who went to school to study psychology, it is frustrating for me to deal with people like that because I care and I want to understand where they are coming from. It is mostly hard when it is a loved one and I don't know what their heart is hiding from me.
But what God has been pressing on my heart is that He knows what is in their hearts. Nothing is hidden from Him. He sees all and knows all. Resting in that helps me to pray for those who I want to know what is hidden in their hearts in order to bless them.
Here are some things that we can pray for those who have hidden things in their hearts
1) Ask God to reveal to you things that He wants to show you from their hearts
2) Ask God to see them the way He sees them.
3) If you struggle with feeling frustration or anger towards them, pray that God can reveal to you what is hidden in your heart to be able to reach that person the way He wants you to.