Lord knows I've tried

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.
See also: know, lord, tried