Non-contestable clause protects insureds by limiting late fraud claims and preventing rescission after reliance on premiums. A Non-contestable clause secures the insured's indemnity by imposing short contractual limitations on belated allegations of fraud or mistake and on rescission, where the insured has detrimentally relied on the policy by paying premiums and foregoing other insurance, thereby preventing the insurer from voiding coverage or reclaiming benefits on post-issuance grounds.