Jesus said,

The words that I speak to you are spirit, and they are life.

John 6:63 - NKJV

When Jesus by His Spirit speaks to you God's Word then the words spoken come as spirit and life to you. The Holy Spirit at these times is anointing His words making them spirit and life and so a wonderful sense of well-being arises in your heart. It happens because your heart is being prospered. So while you're reading you should be asking, "Is my heart being prospered by the Word I am reading?"

You should ask questions like this is your daily activities too - ask yourself, "Is my heart being prospered by where I am or what I am engaged in?" Then you look to the inner witness of the Holy Spirit. Your inner witness will let you know whether you're in the right place doing the right thing or whether you need to move on.

(Notice where the witness of being in the right place or doing the right thing comes from. Don't look to your body or your mind and emotions. They can be screaming "Stop!" and "Get out of here!" when you're right where God wants you to be. Why? Because the devil puts the squeeze on them attempting to get you to forsake God's pathway into His plan for you.)