Evidence Act, Section 3, a fact is said to be proved when the court either believes it to exist or considers its existence so probable that a prudent man ought, under the circumstances of the particular case, to act upon the supposition that it exists. The belief regarding the existence of a fact may thus be founded on a balance of probabilities. A prudent man faced with conflicting probabilities concerning a fact-situation will act on the supposition that the fact exists, if on weighing the various probabilities he finds that the preponderance is in favour of the existence of the particular fact. As a prudent man, so the court applies this test for finding whether a fact in issue can be said to be proved. The first step in this process is to fix the probabilities, the second to weigh them, though the two may often intermingle. The impossible is weeded out at the first stage, the improbable at the second. Within the wide range of probabilities the court has often a difficult choice to make but it is this choice which ultimately determines where the preponderance of probabilities lies. Important issues like those which affect the status of parties demand a closer scrutiny than those like the loan on a promissory note: “the nature and gravity of an issue necessarily determines the manner of attaining reasonable satisfaction of the truth of the issue [ Per Dixon, J. in Wright v. Wright, (1948) 77 CLR 191, 210] ”; or as said by Lord Denning, “the degree of probability depends on the subject-matter. In proportion as the offence is grave, so ought the proof to be clear [Blyth v. Blyth, (1966) 1 AER 524, 536] ”. But whether the issue is one of cruelty or of a loan on a pronote, the test to apply is whether on a preponderance of probabilities the relevant fact is proved. In civil cases this, normally, is the standard of proof to apply for finding whether the burden of proof is discharged.”
