The phrase "core of wisdom" is correct and usable in written English.
It can be used to refer to the essential or fundamental understanding or knowledge that someone possesses.
Example: "After years of study and experience, she finally reached the core of wisdom that guided her decisions."
Alternatives: "essence of knowledge" or "heart of understanding."
For example, the concept of character strengths has been disaggregated into six core virtues of wisdom, courage, humanity, justice, temperance and transcendence [ 81].
Instead, an inspiring set of speakers exhorted the audience to consider the deep common core of spiritual wisdom that makes us human, rather than the superficial trappings of religious approaches that makes us suspicious and intolerant of each other.
It's astounding to me that the NYTBR is still considered the core of received wisdom in our recidivistic industry, but then the mainstream is in NY, the press is in NY, the inbred-everything is in NY, and blah blah blah.
The partnership between you and Nature lies at the core of the world's wisdom traditions.
With the sole exception of wisdom literature, the core genres are panegyric in nature (i.e., they praise something or someone), and the magical power and use of praise is to instill, call up, or activate the virtues presented in the praise.
But now, the core wisdom of her eloquent speech on the House floor nearly 16 years ago is under threat ― from Congresswoman Lee herself.
Like him, I found the film hollow at its core, treating, as he said, "banalities as if they were words of wisdom".
Even so, it should be recognized that the rigorous medieval theological-political regime against which Moderns have rebelled did have at its core a principle that subjected the exercise of will (or sovereignty) to the test of wisdom.
Deconstruct any book of wisdom, regardless of its originating culture, and you will find story at its core.
