Now, on the valuation of evidence by a trial court, the law is settled. See Mogaji v. Odofin (1978) 4 SC 91 and Solomon v. Mogaji (1982) 11 SC 1. It is that before a court which evidence is adduced by the parties in a civil case comes to a decision as to which evidence it believes or accepts and which evidence it rejects, it should first of all put the totality of the acceptable testimony adduced by both parties on an imaginary scale; it would put the legal evidence adduced by the plaintiff on one side and that of the defendant on the other side and weigh them together. It will then see which is heavier, not by the number of the witnesses called by each party but by the quality or probative value of the testimony of those witnesses. See also Sha Jnr v. Kwan (2000) 8 NWLR (Pt. 670) 685. It is the pre-eminent duty of a trial court which saw and heard witnesses to evaluate the evidence and pronounce on their credibility or probative value and not the appellate court which neither heard the witnesses nor saw them to observe their demeanors in the witness box.
– Musdapher, J.S.C. Pinder v. North (2004)