The author of Hebrews reminds us that the Lord God himself had rested on the seventh day. Our labor is designed to support life and not to accumulate riches. Let us be content with what our Father, according to His will, gives us.
Moses wrote only one Psalm, and this is it. He makes us think about the passing nature of life. He also asks the Lord to teach us to make a difference, so that we make our lives count!
Jesus was telling his Disciples about his imminent suffering and death, and his resurrection. They, however, were not paying attention. They were talking about who was the greatest. This is typically human. Jesus wants us to be spiritual.
In our daily life we often undertake great projects. When we fail we ask ourselves, what went wrong. Jesus told his Disciples that they should have prayed first, before expulsing the demon from the little boy. Prayer ties us to God!