There's a children's song that says: 'Be careful little eyes what you see, oh be careful little eyes what you see, there's a father up above who is looking down in love, oh be careful little eyes what you see.'
These days the media is good at throwing images at us that we otherwise wouldn't choose to look at. For example Page 3 in some newspapers, and adverts on the T.V. My own pet hate is the high violence video game adverts You Tube puts on to children's videos, and you have to watch at least 5 seconds of it. This is the amount of time it takes for your short term memory to pick things up.
Verse 22 and 23 address this issue of what we allow into us via our sight. 'The eye is the lamp of the body. If your eyes are healthy, your whole body will be full of light. But if your eyes are unhealthy, your whole body will be full of darkness. If the light within you is darkness, how great is that darkness!'
So here Jesus tells us how it is our eyes that let either light or darkness into our body. If we look upon good things, for example, reading our Bible, or looking for the good in people, or looking at our friends and family and just seeing how much we love them, then we are allowing the light into us.
However if we look at things we know we shouldn't, for example inappropriate films, or looking at peoples sin and judging them by it, then we are letting the darkness into us.
Are you looking at things you wouldn't look at if you could physically see Jesus sat next to you? Or are you just not being careful and not taking notice of what you are looking at or watching?
We need to remember the song: 'Be careful little eyes what you see, oh be careful little eyes what you see, There's a father up above that is looking down in love oh be careful little eyes what you see!