Shanti Mantra-3

Om poornamadah poornamidam
Poornaat poornamudachyate
Poornasya poornamaadaya
Poornamevaavashishyate

Meaning:
That (pure consciousness) is full (perfect); this (the manifest universe of matter; of names and forms being maya) is full. This fullness has been projected from that fullness. When this fullness merges in that fullness, all that remains is fullness. 

Shanti Mantra-1

By Sri Swami Shivananda
The Divine Life Society, Rishikesh

Om sarveshaam swastir bhavatu
Sarveshaam shantir bhavatu
Sarveshaam poornam bhavatu
Sarveshaam mangalam bhavatu
Sarve bhavantu sukhinah
Sarve santu niraamayaah
Sarve bhadraani pashyantu
Maakaschit duhkha bhaag bhavet

Meaning:

Auspiciousness (swasti) be unto all; peace (shanti) be unto all;

fullness (poornam) be unto all; prosperity (mangalam) be unto all. May all be happy! (sukhinah)  May all be free from disabilities! (niraamayaah) May all look (pashyantu)to the good of others! May none suffer from sorrow! (duhkha)