Lord knows I've tried
Lord knows (that) I've tried
It is the absolute truth that I have tried my best (to do something). A: "You and Jeff just need to spend some time together and bond." B: "Lord knows I've tried. That boy just isn't interested in doing anything other than playing those damned video games." A: "You need to convince her to accept the deal." B: "Lord knows that I've tried, but she is adamantly refusing." A: "Then try harder!"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Lord knows I've tried.
Fig. I certainly have tried very hard. Alice: Why don't you get Bill to fix this fence? Mary: Lord knows I've tried. I must have asked him a dozen times—this year alone. Sue: I can't seem to get to class on time. Rachel: That's just awful. Sue: Lord knows I've tried. I just can't do it.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.