Christ read their hearts without them uttering a word. These men have not even mentioned their misgivings out loud.
When we approach the Lord, we should not only check our actions and our words, but inward thoughts and attitudes also. The reverence which Christ requires of us starts deep within. We cannot remove sin from our own hearts or eradicate our sinful nature, but we can hate it and ask God to put it to death within us. It is impossible to hide anything from the Lord. If you approach him for forgiveness and cleansing, you must be utterly open with him, for he cannot be deceived. With shame we approach him knowing that he reads our hearts and knowing what is in them.