All 3 Uses

discern
in
Self-Reliance, by Emerson
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When we discern justice, when we discern truth, we do nothing of ourselves, but allow a passage to its beams.†
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discern = notice or understand something
When we discern justice, when we discern truth, we do nothing of ourselves, but allow a passage to its beams.†
When good is near you, when you have life in yourself, it is not by any known or accustomed way; you shall not discern the footprints of any other; you shall not see the face of man; you shall not hear any name;—the way, the thought, the good, shall be wholly strange and new.†

Definitions:

(1) (discern)
to notice or understand something -- often something that is not obvious
(2) (meaning too rare to warrant focus)