Whatever we value, we set our eyes on and store up. Whatever it is takes our heart and becomes our master. So Jesus said,
Do not store up for yourselves treasures on earth.Matthew 6:19
When we choose to treasure things apart from Jesus, we fill any space in our hearts where we could treasure the Lord. Jesus builds on this idea-
“No one can serve two masters. Either you will hate the one and love the other, or you will be devoted to the one and despise the other …Matthew 6:24
This brings me to the bit I find most curious.
The eye is the lamp of the body.Matthew 6:22
What I choose to keep my eye out for is what I fill my heart with. If I choose to fill my heart with the God of Love, then the love of God will flow from me. That which I fill my heart with, I become. So,
A good man brings good things out of the good stored up in him, and an evil man brings evil things out of the evil stored up in him.Matthew 12:35
Most things that people set their eyes on are neither good nor bad. However, when we ‘set our eyes’ on them, we make them our idol and our desire for them becomes selfish. This is a desire apart from the love of God and ultimately leads to our storing evil in our hearts and this evil will come out!