John Chrysostom
Therefore, the Savior remarked, "From their fruits ye shall know them." In heretics, one might occasionally observe an upright life; however, in those I have mentioned, this will never be the case. You may ask, what if they feign righteousness even here? But they can be easily discerned. The path that Christ commands us to follow is inherently difficult and demanding. The hypocrite is not inclined to work; their sole focus is on pretense, making them vulnerable to exposure. When the Lord states, "There are few who obtain it," He distinguishes these few from those who merely claim to have it, encouraging us to direct our attention not toward the pretenders but toward those who genuinely walk in the faith.
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But why, you may wonder, did the Savior not unmask these hypocrites but instead entrusted us with the task of identifying them? This was to keep us vigilant and always alert, protecting ourselves from not only overt foes but also from concealed adversaries, to whom Paul warned that "good words deceive the hearts of the unthankful." Therefore, let us not be dismayed when we encounter many of them today; Christ had foretold this. Consider the gentleness of the Savior; He did not command punishment but merely advised us to take care that we are not harmed by them or ensnared through negligence. Furthermore, to counter your claim that recognizing such individuals is impossible, He offers another illustration drawn from nature: "Do they gather grapes from thorns, or figs from thistles?"