a) What is the purpose of temptation?
“To develop human reason, so that it may safeguard humankind from excess.”
If human beings are pressed to use physical things based on their value or usefulness alone, their indifference could have compromised the harmony of the universe. For that reason, God has given humans enjoyable attractions that lead them to carrying out Divine plans. God uses these attractions to also test them with temptations that cause them to commit actions that their human reason should protect them against.