Full Idea
Unlike true belief, knowledge is the result of instruction, …it is always accompanied by a true account [logos], …it is unmoved by persuasion, …and it is the property of scarcely any human beings.
Gist of Idea
Knowledge is taught, has logos, is unshakeable, and is rare
Source
Plato (Timaeus [c.362 BCE], 51e)
Book Reference
Plato: 'Timaeus and Critias', ed/tr. Waterfield,Robin [OUP 2008], p.44
A Reaction
Nowadays we are most likely to challenge the unshakeable condition, since science depends on critical challenges. Indeed Greek dialectic seem to require continual openness to the possibility of error. I like the account/logos. Those who know can teach.