Just because you can’t see or measure something does not mean that it does not exist. In fact, it is precisely invisible things such as soul, spirit, Holy Trinity and the Kingdom of God that are not only part of reality, but the most real things of all. This, in a nutshell, is the first of Dallas Willard’s four critical concerns.
To address this very issue, Dallas wrote The Divine Conspiracy: Rediscovering Our Hidden Life in God. And if a 400+ page book seems too daunting to read, you can hear the author himself expound on the concepts of his paradigm shifting book in this 16-part audio series.
For a more heady, philosophical treatise on the topic, we also have available for you Metaphysics: a complete philosophical course from USC taught by Dallas.