Jamieson, Fausset and Brown on Mark 4:25

25. For he that hath, to him shall be given; and he that hath not, from him shall be taken even that which he hath--or "seemeth to have," or "thinketh he hath." (See on Mt 13:12). This "having" and "thinking he hath" are not different; for when it hangs loosely upon him, and is not appropriated to its proper ends and uses, it both is and is not his.

Parable of the Seed Growing We Know Not How (Mr 4:26-29).

This beautiful parable is peculiar to Mark. Its design is to teach the Imperceptible Growth of the word sown in the heart, from its earliest stage of development to the ripest fruits of practical righteousness.