A.T. Robertson Commentary Mark 4:25

"For he that hath, to him shall be given: and he that hath not, from him shall be taken away even that which he hath." — Mark 4:25 (ASV)

Even that which he hath (κα ο εχε). Luke 8:18 has

even that which he thinketh that he hath or seemeth to have (κα ο δοκε εχειν). It is possible that εχε here has the notion of acquiring. The man who does not acquire soon loses what he thinks that he has. This is one of the paradoxes of Jesus that repay thought and practice.