Final answer:
The lucky money envelope that Marty gave to his father contained money, which is inferred from the reference to a significant slip of paper linked to divine providence.
Step-by-step explanation:
The question asked what was inside the lucky money envelope that Marty gave to his father. Based on the provided reference text, which speaks of a slip of paper being a significant means to an end, described as something straight from God's hand, it can be inferred that Marty gave his father money. The text emphasizes the value of the money as it is used to raise someone out of a difficult situation and equates it to something blessed and ordained for use by all of God's children, without distinction between poor and rich.