people planted in their gardens, so it was called the smallest of seeds. Yet it became the largest plant in their gardens when it was grown.The mustard seed is a striking example of the potential of a seed. Although it starts out small and insignificant, it quickly grows  into something that blesses others.
Now let's consider some things about seeds other than how small they are.  A seed does nothing

until it is planted.  Jesus seems to indicate that our faith is planted by speaking. "If you have faith as a mustard seed, you will say..."So to have mustard seed faith, we have to say something. Saying what

God says in His Word is our best choice.  A seed can even push aside rocks or other obstacles, but it does not do so instantaneously. A seed does not move hindrances by an explosive burst, but by a relentless expansion of growth continually pushing outward and upward.  As a seed becomes a plant, it continues to draw nutrients from its source, and thus continues to grow bigger and stronger, forcing hindrances out of its way. 

 

No seed is ever affected by what other seeds do. Even if other seeds die, it keeps on.  A seed is persistent, never giving up. Only death will stop it from growing and working to produce fruit. This may be the most

important characteristic of a mustard seed: it never gives up!

https://www.zazzle.com/z/oemou?rf=238440510966380888

Matthew 18:19.  KJV ONLINE

“Again I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father which is in heaven.”

4856. sumphóneó

Strong's Concordance

sumphóneó: to call out with, to be in harmony, generally to agree

Original Word: συμφωνέω
Part of Speech: Verb
Transliteration: sumphóneó
Phonetic Spelling: (soom-fo-neh'-o)
Short Definition: I agree with
Definition: I agree with, harmonize with, agree together.

HELPS Word-studies

4856 symphōnéō (from 4862 /sýn, "together with" and 5456 /phōnḗ, "sound, voice," which is the root of the English word, "symphony") – properly, voicing the same opinion because like-minded.

["4856 (symphōnéō) was originally, a harmony of voices, figuratively, to harmonize with in the sense of to agree with" (Souter), i.e. to be in harmony, agreeing, because in one concord (A-S, so also in Plato, Aristotle). 4856 (symphōnéō) is derived from 4859 (sýmphōnos).]    See definition