If we think that God is somehow obligated to bless us, or to give us gifts, then we will likely not be grateful to Him. In truth we are not worthy of anything good from God. We do not deserve any blessings from him. If we are willing to accept this truth, then maybe we will be more thankful when God indeed chooses to bless us. How do we thank God? We come to the Church and we give Him gifts of thanks through our stewardship, olive oil for the lamps, prosforo for Holy Communion. Rather than demand that God does what we want, we can be grateful to God even when we do not deserve those blessings.