If this man could make such an observation, can you imagine the perception of the rest of the world?
Our behavior demonstrates our beliefs. If we're not acting out of love, we are not following the example of Christ: kindness, compassion, patience, tolerance, long suffering, temperance, sacrifice, selflessness and charity.
Whatever is in our heart determines what we say. On the Day of Judgment people will have to give account for every careless word they have spoken. These reruns will not be pleasant for anyone.
“Not everyone who calls out to me, ‘Lord! Lord!’ will enter the Kingdom of Heaven. Only those who actually do the will of my Father in heaven will enter."