Were gain to me (en moi kerdē). “Were gains (plural, see note on Phi 1:21) to me (ethical dative).” Paul had natural pride in his Jewish attainments. He was the star of hope for Gamaliel and the Sanhedrin.
Have I counted (hēgēmai). Perfect middle indicative, state of completion and still true.
Loss (zēmian). Old word for damage, loss. In N.T. only in Phil. and Act 27:10, Act 27:21. Debit side of the ledger, not credit.