Quotation על ויקרא 19:18

That it is inappropriate to count the [statements] of the negative commandments and the positive commandments, but rather the items prohibited by them or commanded by them.

Negative commandments of the duties of the heart are the converse of those just mentioned. Also included among them: to not covet, avenge, nor bear a grudge; as written "you shall not avenge nor bear a grudge" (Levit. 19:18).