John Chrysostom
Mark recounts that when they approached Him with their inquiry, He replied, 'Why does this generation seek a sign?' (Mark 8:12). Though one might expect such a question to elicit frustration and wrath, the compassionate and tender Lord experiences sorrow and anguish for them, akin to the grief felt for the unhealed sick who, after witnessing numerous demonstrations of His might, still challenge Him. Their questioning was not aimed at genuine belief but rather at trapping Him. Had their purpose been to believe, He would have surely provided them a sign. He who earlier addressed the woman with 'It is not good' (Matt. 15:26) to then bestow a blessing would have likewise granted them a sign.
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Yet, because their request was not motivated by a desire to believe, the Redeemer labels them as hypocrites elsewhere, noting their words and thoughts were at odds. If they truly held faith, they would not have sought a sign, and their lack of belief is evident in their reaction to His admonition; they did not persist in their demand nor express, 'We lack understanding and wish to learn.'