Is It Wrong to Get a Job Instead of Volunteering My Time to Help Others?

Questions about whether it’s a sin to get a job for extra money instead of volunteering one’s time to help others and a biblical response to the phrase “I don’t want to put the Holy Spirit in a box.” 

• Would it be a sin to get a job for extra money instead of volunteering my time to help others?
• What’s a good biblical response to the phrase “I don’t want to put the Holy Spirit in a box”?