What is a radical sign?

"er... I dunno. I forgot liao... I was a math student more than 8yrs ago..."

O man... That was the answer I gave... But actually, i do remember just not confident. Cos it's not a part that has been used regularly for the last many yrs.

But it left me thinking... Why didn't i try to even say or make a guess? That evening, Pst preached on it...

In math, when u put a radical sign over a number, u are returned with a smaller value, a base of the number. The radical sign in the life of a leader should always cause him to go back to his root, his base, his foundation, his lowest form or basic form of his calling and purpose.

Praying. The Holy Spirit. Fasting. Jesus. Loving. God.

During the leaders mtg, I was reminded of Nehemiah building the walls of the city. Without walls, the city is under vulnerability to the attack of the enemies. We need to fight the enemies, but we need to oso build the walls that are broken down that will protect us eventually.

Some walls are broken. I need to fight, but i need to build too.

Neh 3:6 says, 
Moreover Jehoiada the son of Paseah and Meshullam the son of Besodeiah repaired the Old Gate; they laid the beams thereof, and set up the doors thereof and the locks thereof and the bars thereof.

The Bible says we enter His gates with thanksgivings. Gates speak of the stepping from the outside to the inside. What's the "Old Gate" I need to repair? I got to carefully repair every part of it. Lay the beams, set up the doors, the locks, the bars.

If the gate is down, the city is lost. I gotta fight, but not forget to have a strong gate that had enabled me to enter in from the outside to the inside.