A Catholic explanation of why it is okay to ask the saints to pray for us, or in other words, "pray to the saints." (The audio is terrible, I know. This was my first video. If it bothers you, see the info below for the video's essential contents.)
Matthew 17:3-4 & Luke 9:28-31.
Moses and Elijah (who are clearly Heavenly saints, not "saints" in the way Paul would sometimes use the word) are with Christ during the Transfiguration.
The martyrs can talk to God.
From those three passages, we can gather that the saints in Heaven interact with God.
1 Timothy 2:1 & James 5:16.
It is good for Christians to pray for one another.
Now, if the saints interact with God and are aware of earthly events, why wouldn't they pray for us, considering that it is good for Christians (which the angels and saints definitely are) to pray for one another?
Nothing imperfect will enter into Heaven.
Because the saints have reached perfection (they are in Heaven), their prayers are more effective than the prayers of those that are less righteous, so that's why one might ask them to pray instead of asking another Christian on Earth.
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