The Sermon on the Mount is the central teaching of Jesus' public ministry. In the Sermon on the Mount, Jesus taught the Beatitudes, the Lord's Prayer, about the Kingdom of God, and how we are to act towards God and one another as His disciples.
Beatific Vision
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The Beatific Vision refers to when we finally see God in Heaven face-to-face, as He is. Beatific means "bliss, happiness, or blessing."