19 "Do not store up for yourselves treasures on earth, where moth and rust destroy, and where thieves break in and steal.
20 "But store up for yourselves treasures in heaven, where neither moth nor rust destroys, and where thieves do not break in or steal;
21 for where your treasure is, there your heart will be also.
22 "The eye is the lamp of the body; so then if your eye is clear, your whole body will be full of light.
23 "But if your eye is bad, your whole body will be full of darkness. If then the light that is in you is darkness, how great is the darkness!
24 "No one can serve two masters; for either he will hate the one and love the other, or he will be devoted to one and despise the other. You cannot serve God and wealth.
"When they received it, they grumbled at the landowner,
'Is it not lawful for me to do what I wish with what is my own? Or is your eye envious because I am generous?'
What is the meaning of this peculiar verse? John Piper has the answer, and he sees with clarity!
"What does the bad eye refer to in Matthew 20:15? It refers to an eye that cannot see the beauty of grace. It cannot see the brightness of generosity. It cannot see unexpected blessing to others as a precious treasure. It is an eye that is blind to what is truly beautiful and bright and precious and God-like. It is a worldly eye. It sees money and material reward as more to be desired than a beautiful display of free, gracious, God-like generosity."
You can read What is the 'Bad Eye' in Matthew 6:23?, by John Piper, Desiring God at One Place.