You are what you eat. You are what you say. You are what you think. You can be a clear vessel for Him to the extent that these things are not clogging your vessel. When you eat junk food or a lot of sugar or drink a lot of alcohol, that clogs your vessel. When you say hurtful words, especially speak things that are not true on purpose, when you try to demean someone else or have power over them with your words, that clogs your vessel. When you think negative thoughts, when you think hateful thoughts, jealousy, resentment, irritation, pride, or self pity, when you think you are not lovable, or capable, or One with Him, that clogs your Divine vessel. Of course, you cannot really shut Him out, because you are One with Him, but you can BELIEVE you have shut Him out, and that prevents you from feeling His Presence.