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There will come a time of rest, but in this life rest is something that is of short duration at best:

15 When our enemies heard that their plot was known to us, and that God had frustrated it, we all returned to the wall, each to his work.
16 From that day on, half of my servants worked on construction, and half held the spears, shields, bows, and body-armor; and the leaders posted themselves behind the whole house of Judah,
17 who were building the wall. The burden bearers carried their loads in such a way that each labored on the work with one hand and with the other held a weapon.
18 And each of the builders had his sword strapped at his side while he built. The man who sounded the trumpet was beside me.
19 And I said to the nobles, the officials, and the rest of the people, “The work is great and widely spread out, and we are separated far from one another on the wall.
20 Rally to us wherever you hear the sound of the trumpet. Our God will fight for us.”
21 So we labored at the work, and half of them held the spears from break of dawn until the stars came out.
22 I also said to the people at that time, “Let every man and his servant pass the night inside Jerusalem, so that they may be a guard for us by night and may labor by day.”
23 So neither I nor my brothers nor my servants nor the men of the guard who followed me ever took off our clothes; each kept his weapon in his right hand.  Neh 4:15-23 (NRSV)

We are building God’s New Creation – one hand bent to work and the other reaching for a weapon.  In our zeal to celebrate the Good News and bring peace to all mankind, we shouldn’t forget that there really are powers opposed to this.  Not everyone is of good will.  Vigilance is not a bad thing under such circumstances, so long as it is tempered with love.