St John of Kronstadt | You pray to the true God, but you serve the god belly...

You do not receive from God what you ask Him, because you do not put aside the abomination of idolatry: the service of your belly.

You pray to the true God, but you serve the god belly. 
"No man can serve two masters."

Cease to serve the idol, the belly, and then trust to receive from God that which you ask Him. Else you pray to the true God and serve a false God.

Ask Him if He can give you what you ask. Or you serve the demon of extortion, and therefore the true God, Whom you neglect and forsake, does not fulfil your prayers.

Or else you serve the idol of pride and vanity, and this idol takes possession of your heart as other idols do, and therefore the Lord does not listen to the prayers of an idolatrous heart.

"They have forsaken Me, the fountain of living water, and hewn them out cisterns, broken cisterns"; well, then, drink out of these cisterns—dead, dark water. "Dark water and thick cloud."

St John of Kronstadt