When reading the Bible it’s important to interact mentally with what you are reading. Then try crystallizing in your mind what you understand is being said. Sometimes this process just happens.
When reading, a thought germinates in your mind. As it develops in your mind you might still be reading the text. Two things are going on at the same time. When this happens, I usually stop long enough to write out the thought that is developing in my mind. I might read on to a logical break in the account or I might stop right after writing the thought down.
This is a good time for reflection or meditation. Try re-writing the thought more clearly and cogently. Think about it some more. Then go back and re-read the portion that prompted the thought. Crosscheck to see that the thought is consistent with what God says in His Word. Sometimes this process leads to a re-writing of the thought so it says in your words what you understand God is saying in His Word, the Bible.
Finally, prayerfully apply to your own life what you have written out. I call such a thought an impact thought.
While reading Mark 4:21-25 the following thought emerged in my mind: “Be attentive to listen to what God says. Then try to understand it. Once understood, implement it or you will not only loose what you have received, you will not be able to receive any additional truth.” Or you could put it this way: “You keep, and have added to it, only what you use in your own life and what you share with others.”