Samatha Sutta. A monk should practise introspection as to whether he has won insight of the higher and insight into the dhamma, and also peace of heart. Then he must put forth special effort to acquire what he has not won, and he must obtain his requisites in such a way that unprofitable states wane in him and profitable states increase. A.v.98ff.

Dictionary of Pali Proper Names, G P Malalasekera (1899-1973), which is available as printed version from