Why is the mariner unable to pray in the rime of the ancient mariner and what made this change?

The mariner is unable to pray because he has committed a selfish act by killing the albatross, causing a disruption in the natural order. This act distances him from God's grace and makes him unable to pray. His change comes when he sees the beauty in nature and the interconnectedness of all living things, leading him to appreciate and respect God's creation.