In KSA, I could take several first-year university courses at KAIST that would officially transfer to my university transcript later. In the transcript, you can see several subjects under ‘credits transferred’, and those courses are what I transferred from KSA. I took 'Calculus 2' (College Calculus) when I was a high school freshman, and took 'Calculus 3' (Vector Calculus) when I was a high school sophomore. I should take those math courses with ordinary KAIST students during summer vacation. Thus, please consider the circumstances that when I got B+ on 'Calculus 2', I was only the freshman in high school and I had to compete with the most excellent college students in Korea. Furthermore, I also had to participate in my research program at the same time. However, I understood all concepts and theories without great difficulty. And I have received many A+'s in many mathematics courses including 'Analysis 1' (A+; more advanced course than Calculus 2).

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I want to use an expression 'the lens of truth' or 'the eyes of truth' to describe the tools or ability to find[detect] hidden facts or truth of the world. Are those invalid expression? Do people normally not use those expression? Could you please suggest any other idioms or figurative expressions?