This quote suggests that while the ‘productive’ man, or someone who is highly efficient and effective in their work, is indeed commendable, there is still a higher level of human potential. This ‘higher species’ could refer to individuals who not only excel in their work but also transcend the mundane and ordinary to reach extraordinary heights of creativity, innovation, and wisdom. It could also refer to individuals who are morally and ethically superior, embodying virtues such as kindness, empathy, and integrity.

In the context of personal development, this quote could be interpreted as an encouragement to strive for more than just productivity. In today’s world, where efficiency and productivity are highly valued, it’s easy to fall into the trap of equating one’s worth with one’s output. However, Nietzsche’s quote serves as a reminder that there’s more to personal growth than just being productive. It’s about developing one’s character, nurturing one’s creativity, and cultivating one’s wisdom.

Applying this in today’s world, it could mean striving for a balance between productivity and other aspects of life, such as personal growth, relationships, and health. It could also mean pursuing goals that are not just about personal gain but also contribute to the greater good. It could mean striving to be a ‘higher species’ who is not just productive but also wise, kind, and empathetic.