“81. … It is also well settled that first attempt should be made by the courts to uphold the charged provision and not to invalidate it merely because one of the possible interpretations leads to such a result, howsoever attractive it may be. Thus, where there are two possible interpretations, one invalidating the law and the other upholding, the latter should be adopted. For this, the courts have been endeavouring, sometimes to give restrictive or expansive meaning keeping in view the nature of legislation, maybe beneficial, penal or fiscal etc. Cumulatively it is to subserve the object of the legislation. Old golden rule is of respecting the wisdom of legislature that they are aware of the law and would never have intended for an invalid legislation. This also keeps courts within their track and checks individual zeal of going wayward. Yet in spite of this, if the impugned legislation cannot be saved the courts shall not hesitate to strike it down. Similarly, for upholding any provision, if it could be saved by reading it down, it should be done, unless plain words are so clear to be in defiance of the Constitution. These interpretations spring out because of concern of the courts to salvage a legislation to achieve its objective and not to let it fall merely because of a possible ingenious interpretation. The words are not static but dynamic. This infuses fertility in the field of interpretation. This equally helps to save an Act but also the cause of attack on the Act. Here the courts have to play a cautious role of weeding out the wild from the crop, of course, without infringing the Constitution. For doing this, the courts have taken help from the Preamble, Objects, the scheme of the Act, its historical background, the purpose for enacting such a provision, the mischief, if any which existed, which is sought to be eliminated. …” (Emphasis supplied)