Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
An earnest temper; may be enlightened (Num. 25:11-13; 2 Cor. 7:11, 9:2), or ignorant and misdirected (Rom. 10:2; Phil. 3:6). As a Christian grace, it must be grounded on right principles and directed to right ends (Gal. 4:18). It is sometimes ascribed to God (2 Ki. 19:31; Isa. 9:7, 37:32; Ezek. 5:13).