In today's Gospel, some Pharisees tested Jesus by asking Him: Is it lawful for a man to divorce his wife? Among the Jews there were two schools of thought on divorce. One school would only allow marital unfaithfulness as a justification for divorce. The other school, however, would allow a man to divorce his wife if she did anything he did not like.
Jesus leveraged this opportunity to explain the true meaning of marriage: "what God has joined together, man must not separate."
In the past few decades, we see divorce rates rise in many developed countries. It seems almost impossible to be true to one's spouse in good times and in bad, in sickness and in health. When the disciples heard Jesus' words, they said: "it is better not to marry".
As Catholics, we know that with our human limits, to sustain a marriage is beyond our own power. We might also be influenced by the societal trends and be tempted to give up. If we believe that Christian marriage is a sacrament, then we should trust that God would keep granting us grace to sustain our marriages.