Final answer:
We infer the speaker's confidence in Nature answering his prayer from the strong and confident tone in their voice and posture which is described as contrary to that of prayer.
Step-by-step explanation:
The confidence that Nature will answer the speaker's prayer in the literary contexts provided can be inferred from cues within the texts themselves. Specifically, we can look at the last section quoted, where the speaker's voice becomes strong and confident as they call out to an entity above. This tone of certainty and the description of their posture being antithetical to prayer implies a belief that the expected response is assured. This is juxtaposed with Wordsworth's character in "The World Is Too Much with Us," who yearns for a connection with the divine in nature, suggesting an alternate perspective where nature is capable of answering human longing or spiritual desires.