Buy truth, and do not sell it; buy wisdom, instruction, and understanding.
(Pro 23:23 ESV)
This is not unlike last week’s Proverb about applying your heart to understanding; it takes effort. In this case the effort may be money. How does one “buy” truth? The commentaries and dictionaries I have access to seem to suggest that “buy” is meant figuratively in the sense that coming into possession of it is costly and worthwhile; it is not literally about money. Truth doesn’t rain from heaven, randomly falling into your lap, but is something you need to work for. But, oh, the reward of your effort.
Also notice that “wisdom, instruction, and understanding” are tied to “truth.” The concept of truth, in this case, is clearly both academic in nature (instruction and understanding) and also contains more than a hint of personal maturity (wisdom). Truth is not merely propositional, it is personal and transformative.