(1.17) The nature of truth is spiritual.
“Spiritual” is the creative power of thought and our ability to consciously direct concentrated thought toward the achievement of specific goals.
(1.16) We may know the truth by a recognition of the fact that truth is the vital principle of the universe and, therefore, omnipresent.
Spirit–the ability to manifest form from thought–is, thus, the vital principle of the universe
(1.15) If the premise is false, we are unable to form a conception of the results that may ensue.
The premise is false if we desire something but think something else,
(1.14) If we know the truth, we can readily predict the outcome of any action based on a true premise.
If we understand that thought is the cause and form (conditions) are the effect, we can anticipate effects based on our consistency with regards to holding an object of thought; quite simply, what we spend time doing will–to a large degree–determine what we are thinking about.
(1.13) A knowledge of the truth is the underlying condition necessary for every business transaction and social relation.
Truth = our ability to affect form with directed attention.
(1.12) Right thinking is the imperative condition for all well being.
How we think affects how we feel.
Aperture of Brahma 