pride oneself on
Also, take pride in. Be proud of, take satisfaction in, as in We pride ourselves on always being punctual, or She took pride in her flower garden. The first term dates from the late 1300s, the second from the late 1500s.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.