A life insurance company doing business in this State shall not make any distinction or discrimination in favor of individuals between insurants of the same class and equal expectation of life in the amount of payment of premiums or rates charged for policies of life or endowment insurance, or in the dividends or other benefits payable thereon, or in any of the terms and conditions of the contracts it makes; nor shall any such company or any agent thereof make any contract of insurance or agreement as to such contract other than as plainly expressed in the policy issued thereon, nor pay or allow as inducement to insurance any rebate of premium payable on the policy, or any special favor or advantage in the dividends or other benefit to accrue thereon, or any valuable consideration or inducement whatever not specified in the policy contract of insurance; nor give, sell, or purchase, or offer to give, sell, or purchase as inducement to insurance or in connection therewith any stocks, bonds, or other securities of any insurance company or other corporation, association, or partnership, or any dividends or profits to accrue therein, or anything of value whatsoever not specified in the policy. (1899, c. 54, s. 57; 1903, c. 438, ss. 5, 10; Rev., s. 4775; 1911, c. 196, s. 7; C.S., s. 6458.)