Verse 9 Not slack concerning his promise; not negligent in fulfilling it.--As some men count slackness; infer slackness,--that is, from the long delay. The idea is, that the lapse of time which intervenes before the threatenings of God are executed does not arise from neglect or forgetfulness, as some men suppose, but from forbearance and long-suffering, in hope that the sinner may repent.