Cruelly, as noted above, includes mental cruelly, which falls within the purview of a matrimonial wrong. Cruelty need not be physical. If from the conduct of his spouse same is established and/or an inference can be legitimately drawn that the treatment of the spouse is such that it causes an apprehension in the mind of the other spouse, about his or her mental welfare then this conduct amounts to cruelty. In delicate human relationship like matrimony, one has to see the probabilities of the case. The concept, a proof beyond the shadow of doubt, is to be applied to criminal trials and not to civil matters and certainly not to matters of such delicate personal relationship as those of husband and wife. Therefore, one has to see what are the probabilities in a case and legal cruelty has to be found out, not merely as a matter of fact, but as the effect on the mind of the complainant spouse because of the acts or omissions of the other. Cruelty may be physical or corporeal or may be mental. In physical cruelty, there can be tangible and direct evidence, but in the case of mental cruelty there may not at the same time be direct evidence. In cases where there is no direct evidence, Courts are required to probe into the mental process and mental effect of incidents that are brought out in evidence. It is in this view that one has to consider the evidence in matrimonial disputes.