WASHINGTON (CNN) -- President Bush on Friday addressed the graduating class of a Pennsylvania college, telling them their lives will be enriched if they serve their community and help those in need.

"The volunteer spirit of America makes us unique," Bush told graduates of St. Vincent College near Latrobe, Pa. "It represents the true strength of our nation and it must constantly be reinvigorated and renewed. "

He urged students to "serve a cause larger than yourselves. When you serve your fellow citizens, you find benefits you'll never imagine. ... You always get more out of service than you give."

Bush interspersed his commencement speech by naming some St. Vincent students and extolling their good works, which included mentoring youths or volunteering in an AIDS clinic in Brazil. "Here at St. Vincent College, you have learned that service outside the classroom is as important as what you learn inside the classroom. ... All you need is a warm heart and a willing pair of hands."