Ye may rejoice (charēte). Second aorist passive subjunctive with hina in final clause of chairō, to rejoice.
That I may be the less sorrowful (kagō alupoteros ō). Present subjunctive with hina and comparative of old compound adjective alupos (a privative and lupē, more free from grief). Beautiful expression of Paul’s feelings for the Philippians and for Epaphroditus.