In granting any variance, the Planning and Zoning Commission may prescribe appropriate conditions and safeguards in conformity with this Zoning Ordinance as will, in its opinion, secure substantially the objectives of this Zoning Ordinance. Violations of such conditions and safeguards, when made a part of the terms under which the variance is granted shall be deemed a violation of this Zoning Ordinance. Under no circumstances shall the Commission grant a variance to allow a use not permissible under any of the terms of this Zoning Ordinance in the district involved, or any use expressly or by implication prohibited by the terms of this Zoning Ordinance in such district.