Here the author refers to himself by his "heart" to emphasize his feelings. See how you translated this in [Ecclesiastes 1:17](../01/17.md). Alternate translation: "I applied myself" (See: [[rc://en/ta/man/jit/figs-synecdoche]])
This refers to things that are done on earth. See how you translated this in [Ecclesiastes 1:3](../01/03.md). Alternate translation: "on the earth" (See: [[rc://en/ta/man/jit/figs-idiom]])