Some Christians are heroes in their daydreams only. The characteristic mark of such heroism is imagining ourselves as faithful on great and public occasions and in rarefied atmospheres when others will be impressed. In stark contrast, true faithfulness in Scripture is first exercised in small things and in private. If we fail there, any faithfulness we show in public will be hypocrisy, a performance for the crowd and not an expression of loyalty to our Lord.
Daniel and his three friends were under intense pressure. Their consciences (educated by God’s Word and devoted to it) were under attack. The pressures to conform were intense. No doubt there were others, Jerusalem-born like themselves, who laughed at their sensitivities. What harm would good food do them, or new names? It is interesting and instructive to see their response. – The Preacher’s Commentary, Daniel