The word Islam means to submit to the will of God, and is derived from a word for peace. Islam teaches that God (Allah) is merciful and compassionate. He promises the faithful peace and equality, and entrance to eternal Paradise.
Once we humble ourselves, rid ourselves of our egoism and submit totally to Allah, and to Him exclusively, in faith and in action, we will surely feel peace in our hearts.
Establishing peace in our hearts will bring about peace in our external conduct as well. Islam is careful to remind us that it is not a religion to be paid mere lip service; rather it is an all-encompassing way of life that must be practiced continuously for it to be Islam.