For out of Zion shall come a mighty army of resurrected believers who shall trample all over the enemy and destroy every root of offense, backbiting, bitterness, and hate.

My children are ready to go forth and clean up the paths of unrighteousness that have been strewn all across the land.

There is absolutely nothing that will stop this mighty army of believers; for they have been to the threshing floor over and over again and they know whom their redeemer is and they will follow Him through thick and thin.

The righteousness of these believers will be seen where ever they go and all will see that they have determination written all over them and all will know they are an army not to be reckoned with.

I understand the phrase “to be reckoned with” means something that must be considered or dealt with, but does “not to be reckoned with” suggest something which is too significant/big to deal with (a force one cannot hope to influence)

Joel 2:1-11 (ETRV)
1 Blow the trumpet on Zion.♦ Shout a warning on my holy mountain. Let all the people who live in the land shake with fear. The LORD’s special day is coming; it is near.
2 It will be a dark, gloomy day. It will be a dark and cloudy day. At sunrise you will see the army spread over the mountains. It will be a great and powerful army. There has never been anything like it before, and there will never be anything like it again.
3 The army will destroy the land like a burning fire. In front of them the land will be like the Garden of Eden. Behind them the land will be like an empty desert. Nothing will escape them.
4 They look like horses. They run like war horses.
5 Listen to them. It is like the noise of chariot♦ riding over the mountains. It is like the noise of flames burning the chaff.♦ They are a powerful people, who are ready for war.
6 Before this army, people shake with fear. Their faces become pale from fear.
7 The soldiers run fast. They climb over the walls. Each soldier marches straight ahead. They don’t move from their path.
8 They don’t trip each other. Each soldier walks in his own path. If one of the soldiers is hit and falls down, the others keep right on marching.
9 They run to the city. They quickly climb over the wall. They climb into the houses. They climb through the windows like thieves.
10 Before them, earth and sky shake. The sun and the moon become dark, and the stars stop shining.
11 The LORD calls loudly to his army. His camp is very large. The army obeys his commands. His army is very powerful. The LORD’s special day is a great and terrible day. No one can stop it.