This week we learn about Sarah's laughter when she learned she would have a son in her old age. The week's readings: Genesis 18:1-2,10-15; 21:1-7; Jeremiah 27:17-18,26-27; Zechariah 8:6; Psalm 105:19; Mark 10:27; 1 Thessalonians 5:24; Hebrews 11:11-12