" Spain held the doctrine (and was right in holding it) that every human enterprise should stand on two pillars – the temporal and the spiritual. To depend upon one of these pillars alone is to call down final failure upon any undertaking. "
- Edwin Markham

The quote suggests that any human endeavor should be supported by both temporal and spiritual foundations. This means that practical or worldly considerations must be balanced with moral, ethical, or religious principles for success. Depending solely on one aspect will inevitably lead to failure.

At a deeper level, the statement underscores the importance of balance in various aspects of life and decision-making processes. It implies that human efforts can often falter when they neglect either the pragmatic or the spiritual dimensions, leading to incomplete or flawed outcomes. This principle applies not only to personal endeavors but also to societal structures and institutions. For example, a business might thrive financially but flounder ethically if it ignores corporate responsibility and moral accountability. Similarly, religious practices alone without practical application can lead to idealism that is disconnected from reality.

The quote was written by Edwin Markham, an American poet and author who lived from 1852 to 1940. He was known for his socially conscious poetry that often addressed issues of social justice and human rights. His work frequently emphasized the importance of compassion, ethics, and a balanced approach to life's challenges.