The quote you mentioned is a humorous play on words that highlights two different types of people and the impact they have on others around them.
"Some cause happiness wherever they go": This part refers to individuals who possess a positive and uplifting presence. Wherever they are, they bring joy, happiness, and a sense of positivity to the people they interact with. These individuals have a way of spreading happiness and making others feel good simply by being around them.
"Others, whenever they go": On the other hand, this part refers to people who have a negative or unpleasant impact on those around them. Whenever they leave a place or a situation, the people around them feel relieved or happy. This implies that their presence may have been disruptive, upsetting, or draining, and people feel better when they are no longer present.
Overall, the quote is a clever way of highlighting the contrasting effects different personalities can have on their surroundings. It suggests that some people bring happiness with them wherever they go, while others bring happiness only when they leave.