Final answer:
The quote suggests the importance of being committed to a cause.
Step-by-step explanation:
The quote "Well, one must be serious about something" suggests the importance of being committed to a cause.
When someone is serious about something, it means they are dedicated and focused on achieving a particular goal or purpose.
For example, if a person is serious about protecting the environment, they would take actions such as reducing waste, conserving energy, and advocating for policies that promote sustainability.