Step 1: Identifying the key point in paragraph 1
The passage states that humour can be used to entertain others and make them laugh. However, it also mentions that humour can be used to criticize others with witty remarks. This shows that humour has both a positive and a negative aspect.
Step 2: Explanation
Since humour can bring joy and amusement but also be employed as a sharp tool to mock or demean others, it acts as a double-edged sword.