What a fascinating phrase to dissect! While the sentiment might sound harsh at first glance, it's actually quite common in motivational contexts. The most natural English equivalent would probably be "Those without ambition are fools" – it captures the original's bluntness while maintaining grammatical flow.
Interestingly, this kind of statement appears frequently in classic literature. Think of Shakespeare's Polonius advising "To thine own self be true" in 'Hamlet', implying that self-betrayal through laziness constitutes folly. The phrasing could be softened to "People lacking drive make unwise choices" for less confrontational situations, preserving the core idea about ambition's value without direct name-calling.
直訳すると"Those without spiritual aspirations are fools"となりますが、これだと少し堅苦しい印象です。より自然な英語表現を探すなら、"People who lack spiritual growth are fools"とか"Those without a thirst for self-improvement are idiots"といった言い回しが考えられます。