Therefore let him that thinks he stands take heed lest he fall.
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Paul says this to those who, relying on their knowledge that it was lawful to eat anything, were a cause of scandal to their weaker brethren. Thinking that they had risen to a higher level, they in fact declined because of the teaching of the false apostles and condemned Paul when they were the guilty ones. Commentary on Paul’s Epistles.
Let him that thinketh he standeth take heed lest he fall. S. Augustine (de Bono Persev. cviii.) says: "It is good for all, or nearly all, not to know what they will be, that each one, from not knowing that he will persevere in good, may humbly and anxiously pray for the grace of God, and with it do all he can to watch against falling and to persevere in grace."
Also that, rebuking the haughty, and breaking down their arrogance, he says in his epistle, "Let him that thinketh he standeth, take heed lest he fall; ".
Also in the first Epistle of Paul to the Corinthians.: "And let him that thinketh he standeth take heed lest he fall."
Take heed lest he fall. This regards the doctors and teachers in the new Church of Corinth; who, relying upon their own learning, did not think themselves weak, and presuming too much upon their own strength, exposed themselves to the danger of falling. See St. Chrysostom and St. Augustine, de dono. Persev.
Self-diffidence is the foundation of our strength. We prevent many dangerous falls when we keep close to the earth by humility.
Again, he casts down their pride who thought highly of their knowledge. For if they who had so great privileges suffered such things; and some for murmuring alone were visited with such punishment, and others for tempting, and neither their multitude moved God to repent , nor their having attained to such things; much more shall it be so in our case, except we be sober. And well said he, he that thinks he stands: for this is not even standing as one ought to stand, to rely on yourself: for quickly will such an one fall: since they too, had they not been high-minded and self-confident, but of a subdued frame of mind, would not have suffered these things. Whence it is evident, that chiefly pride, and carelessness from which comes gluttony also, are the sources of these evils. Wherefore even though thou stand, yet take heed lest you fall. For our standing here is not secure standing, no not until we be delivered out of the waves of this present life and have sailed into the tranquil haven...
Once again, Paul casts down the pride of those who think they know it all. For if the Israelites, who had such great privileges, suffered these things, and if some were punished merely because they were heard to complain, how much more shall we suffer if we are not careful. Anyone who relies on himself will soon fall. For the way in which we stand in this world is not secure and will not be until we are delivered out of the waves of this present life into the peaceful haven of eternal rest. Therefore, do not be proud of your standing, but pay attention so that you will not stumble. If Paul was afraid that it might happen to him, how much more ought we to be afraid also.