en_tn/ecc/01/13.md

I applied my mind

Here the author refers to himself by his "mind" to emphasize his thoughts. AT: "I determined" or "I applied myself" (See: rc://en/ta/man/translate/figs-synecdoche)

to study and to search out

These two phrases mean the same thing and emphasize how diligently he studied. (See: rc://en/ta/man/translate/figs-doublet)

under heaven

This refers to things that are done on earth. AT: "on the earth" (See: rc://en/ta/man/translate/figs-explicit)

children of mankind

"human beings"