In reaction to Doret De Ruyter's recent defence of the importance of ideals in education, I advocate cautiousness in three respects. First, I explain the importance of distinguishing ideals more sharply from goals by demonstrating the problems of considering ideals even approximately realisable. Second, I substantiate my doubts about their indispensability in human motivation, and question the desirability of encouraging the motivational use of ideals. Third, I question whether ideals could or should be passed on in education, drawing attention to their non-objective, personally created nature.