§ 16.   Public support of sectarian instruction prohibited. No appropriation of lands, money or other property or credits to aid any sectarian school shall ever be made by the state, or any county or municipality within the state, nor shall the state or any county or municipality within the state accept any grant, conveyance, gift or bequest of lands, money or other property to be used for sectarian purposes, and no sectarian instruction shall be allowed in any school or institution aided or supported by the state.