What is the Catholic Church's interpretation of 'hunger and thirst for righteousness'?

At Matthew 5:6 (RSVCE), Jesus says: “Blessed are those who hunger and thirst for righteousness, for they shall be satisfied. The concept of physical hunger and thirst, as we understand today, appears to be far different from that the people of Jesus' time had. If it was spiritual hunger and thirst the Jesus was in deed referring to, the attributes would have been similar. I hope that the Church has explained at length, the deeper meaning of hunger and thirst, as would have been in the mind of Jesus when He spoke on the Mount. I wish to know what the official interpretation of Matthew 6:5 in the specific context of day-to-day life of the time of Jesus, and offered by the Catholic Church is.