The illustration of the mustard grain, also recorded in Mark chapter 4, highlights two things: first, the amazing growth of the Kingdom message; second, the protection given to those who accept the message.
قَالَ يَسُوعُ :‏ « بِمَاذَا نُشَبِّهُ مَلَكُوتَ ٱللهِ ،‏ أَوْ بِأَيِّ مَثَلٍ نُمَثِّلُهُ ؟‏