One of the basic principles on which this government was founded is that of the equality of right which is embodied in Section 1, Article III of the 1987 Constitution. The equal protection of the laws is embraced in the concept of due process, as every unfair discrimination offends the requirements of justice and fair play. It has been embodied in a separate clause, however, to provide for a more specific guaranty against any form of undue favoritism or hostility from the government. Arbitrariness in general may be challenged on the basis of the due process clause. But if the particular act assailed partakes of an unwarranted partiality or prejudice, the sharper weapon to cut it down is the equal protection clause. "According to a long line of decisions, equal protection simply requires that all persons or things similarly situated should be treated alike, both as to rights conferred and responsibilities imposed." It "requires public bodies and inst itutions to treat similarly situated individuals in a similar manner." "The purpose of the equal protection clause is to secure every person within a state's jurisdiction against intentional and arbitrary discrimination, whether occasioned by the express terms of a statue or by its improper execution through the state's duly constituted authorities." "In other words, the concept of equal justice under the law requires the state to govern impartially, and it may not draw distinctions between individuals solely on differences that are irrelevant to a legitimate governmental objective." The equal protection clause is aimed at all official state actions, not just those of the legislature. Its inhibitions cover all the departments of the government including the political and executive departments, and extend to all actions of a state denying equal protection of the laws, through whatever agency or whatever guise is taken. It, however, does not require the universal application of the laws to all persons or things without distinction. What it simply requires is equality among equals as determined according to a valid classification. Indeed, the equal protection clause permits classification. Such classification, however, to be valid must pass the test of reasonableness. The test has four requisites: (1) The classification rests on substantial distinctions; (2) It is germane to the purpose of the law; (3) It is not limited to existing conditions only; and (4) It applies equally to all members of the same class. "Superficial differences do not make for a valid classification." For a classification to meet the requirements of constitutionality, it must include or embrace all persons who naturally belong to the class. "The classification will be regarded as invalid if all the members of the class are not similarly treated, both as to rights conferred and obligations imposed. It is not necessary that the classification be made with absolute symmetry, in the sense that the members of the class should possess the same characteristics in equal degree. Substantial similarity will suffice; and as long as this is achieved, all those covered by the classification are to be treated equally. The mere fact that an individual belonging to a class differs from the other members, as long as that class is substantially distinguishable from all others, does not justify the non-application of the law to him." The classification must not be based on existing circumstances only, or so constituted as to preclude addition to the number included in the class. It must be of such a nature as to embrace all those who may thereafter be in similar circumstances and conditions. It must not