Halfway through. You're really getting to know Abraham.
Keep walking in faith.
And he said, I will certainly return unto thee according to the time of life; and, lo, Sarah thy wife shall have a son. And Sarah heard it in the tent door, which was behind him. Now Abraham and Sarah were old and well stricken in age; and it ceased to be with Sarah after the manner of women. Therefore Sarah laughed within herself, saying, After I am old shall I have pleasure, my lord being old also? And the LORD said unto Abraham, Wherefore did Sarah laugh, saying, Shall I of a surety bear a child, which am old? Is any thing too hard for the LORD? Genesis 18:10-14 (KJV)
Sticky Details
Three visitors came to Abraham's tent. One of them — the LORD — made a specific promise: Sarah would have a son within a year. Sarah, overhearing from behind the tent flap, laughed. She was ninety years old. But God's question cuts through every doubt: "Is any thing too hard for the LORD?"
Reflection
Sarah laughed because the promise seemed impossible given her circumstances. What "impossible" promises have you dismissed with a quiet laugh of disbelief?