NOT all waivers, quitclaims INVALID as against public policy

Not all waivers and quitclaims are invalid as against public policy. If the agreement was voluntarily entered into and represents a reasonable settlement, it is binding on the parties and may not later be disowned simply because of a change of mind. It is only where there is clear proof that the waiver was wangled from an unsuspecting or gullible person, or the terms of settlement are unconscionable on its face, that the law will step in to annul the questionable transaction, But where it is shown that the person making the waiver did so voluntarily, with full understanding of what he was doing, and the consideration for the quitclaim is credible and reasonable, the transaction must be recognized as a valid and binding undertaking. (G.R. No. 91298; June 22, 1990)