As people we are infinitely different and there are endless combinations of DNA. While we are different our life all flows from the same source, the voice of God. We are at the same time different and the same.
The same Spirit flows and gives life to all people whether they recognize it or not. Realizing the same Spirit gives life for all people enables us to pray for people and relate to them based on our unity in the mystical body of Christ. This will allow us to begin to love our neighbor as ourself since we will realize that while we are different we are connected at a level that is deeper than any of our differences.
This deeper spiritual reality will enable us to live more peacefully and in harmony with one another. It gives us the ability to "forgive our trespasses as we forgive those who trespass against us". The commonality of our common forgiveness is the source of our divine connection with Christ and the Trinity.