What impressions do we get of Columbus?
Christopher Columbus – born Cristoforo Colombo – grew up in Genoa, Italy and had an insatiable thirst for knowledge and exploration. Even though he was very religious, he had an inkling that the world was round and decided to prove this by sailing west. This would also – he thought – help his Spanish masters to an easier route to India and Asia.
explicit
He had “an insatiable thirst for knowledge and exploration” and was “very religious”
implicit
He seems adventurous as he tried to “prove” his theory about the world being round (what does the second bit imply?)