31. This is still another argument for Tauhid. Here again certain realities of daily experience have been mentioned and it is suggested that man observes these day and night but does not ponder over them seriously, whereas they contain signs and pointers to the reality. The coming together of the man and woman is the cause of man’s own birth. Procreation among the animals also is due to the combination between the male and the female. Also about vegetation, man knows that the law of sex is working in it. Even among the lifeless substances when different things combine with one another, a variety of compounds come into existence. The basic composition of matter itself has become possible due to the close affinity between the positive and the negative electric charges. This law of the pairs which is the basis of the existence of the entire universe, contains in itself such complexities and finenesses of wisdom and workmanship, and there exist such harmonies and mutual relationships between the members of each pair that an objective observer can neither regard it as the result of an accident, nor can he believe that many different gods might have created these countless pairs and matched their members, one with the other, with such great wisdom. The members of each pair being a perfect match for each other and coming into being of new things with their combination itself is an explicit argument of the Creator’s being One and only One.