At first, Telemachus doesn't believe it is possible that he and his father can defeat the suitors, who number more than a hundred best and strongest men from the country. Finally, he gets reassured by his father and puts faith in his words, agreeing to play the part in the plot against the suitors.
When a text is argumental or persuasive, the authors claim will have evidence that backs up their claim in order to convince the audience to agree with them.