12. thinketh he standeth—stands and thinks that he stands [Bengel]; that is, stands "by faith … well pleasing" to God; in contrast to 1Co 10:5, "with many of them God was not well pleased" (Ro 11:20).
fall—from his place in the Church of God (compare 1Co 10:8, "fell"). Both temporally and spiritually (Ro 14:4). Our security, so far as relates to God, consists in faith; so far as relates to ourselves, it consists in fear.