Love? Justice?

"Humans shall observe LOVE and JUSTICE in order to be unified with GOD."
                                                                                                                           - Principles of Caodaism.

But how do we define 'LOVE' and 'JUSTICE'?

How do we observe 'LOVE' when there's so much atrocities,hatred and discrimination happening all over the world?

How do we observe 'JUSTICE' in a society plagued by corruption, greed and narcissism?