near to one's heart
Also, close to one's heart. Loved by or important to one, as in This last painting was very near to her heart, or His first grandson is close to his heart. [Late 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.