Synonyms:

yam–one whom; hi–certainly; na–never; vyathayanti–are distressing; ete–all these; purusam–to a person; purusa-rsabha–O best among men; sama–unaltered; duhkha–distressed; sukham–happiness; dhiram–patient; sah–he; amrtatvaya–for liberation; kalpate–is considered eligible.

Translation:

O best among men [Arjuna], the person who is not disturbed by happiness and distress and is steady in both is certainly eligible for liberation.