You’ve been told that you are what you eat, and you probably don’t disagree with the statement whether or not you live like you believe it. Just as you are affected by the food you put in your body, so it is with your mind. Unless you are a baby or little child, you get to choose what you put into your mouth. What goes into your mind, however, isn’t something you exclusively get to choose. Whether you like it or not, your mind is constantly being fed information that can affect how you think and, therefore, how you live. Notice I said that what goes in can affect the way you think. Unlike food, you can choose to reject what has been fed to your mind once you’ve received it. This requires a move on your part. If you do nothing, it goes in. Enough of the same kinds of philosophies brought in over time and it begins to become a part of you.
In Romans 12:2 Christ’s followers are instructed to “not conform any longer to the pattern of this world, but be transformed by the renewing of your mind.” In The Message, Eugene Peterson puts it this way, “Don’t become so well-adjusted to your culture that you fit into it without even thinking. Instead, fix your attention on God.” If you would be what you choose to be rather than what the world chooses for you, you must be proactive. For the Christ follower, to be what God wants you to be means that you must reject what your culture is feeding you and fill yourself up with God’s truth. This is especially true because the philosophies of this world often run counter to God’s ways (if you’re not convinced of this, just read Romans 12:17-21 as an example).
Are you being proactive in choosing what you accept into your mind? I have seen Christians “change their minds” over time as they have been inundated with the world’s philosophy; they have stopped following what they held to previously. As Peterson says, not only must you “reject what your culture is feeding you”, you must also “fill yourself up with God’s truth”. If you would follow Jesus, spending time reading and meditating on the Bible is not just a nice option, it’s a necessary lifeline.