【不改其乐】〖bù gi qí lè〗[Don't change the fun; Still happy in a difficult situation; Do not change their own have of joy]

不令而信公有制，

改柯易节受唾弃。

其应如响工农振，

乐道安贫爱集体。

不改变自有的快乐。指处于困苦的境况仍然很快乐。not change own have joy. Refers still very happy in difficult situation.