Latin maxim.
• “No one should be allowed to enrich himself unjustly at the expense of another.” (Jenk Cent. Cas. 4; 10 Barb. [N.Y.] 626, 633, “Cyclopedic Law Dictionary,” 2nd Edition, p. 688, cited in Philippine National Bank v. CA, G.R. No. 97995m January 21, 1993)