I was listening to a teaching on this passage yesterday and the speaker said that these last words of Jesus on the cross were also used as a bedtime prayer by Jewish children in those days and one that Jesus likely was taught when he was a child. It is based on Psalm 31:5. I never knew this and I thought it was especially poignant, particularly for Mary who was standing nearby and heard him pray this same prayer when she tucked him in at night as a child. If that doesn't tug at your heartstrings, not sure what will.
Can you give us a reference/link?
If you do a google search it seems to be "common knowledge"I don't have an absolutely definitive linkWarren Wiersbe references it in his bible commentary.