“But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.”—Genesis 17:21 This week, on Doctrine for Life, Dr. Joel Beeke shows us that God’s covenants are sure even in “impossible” circumstances in the first part of his sermon on Genesis 17:15-27. To enjoy more resources from the pen and pulpit of Dr. Beeke, visit joelbeeke.org. The Doctrine for Life Podcast presents weekly sermons from the preaching ministry of the Rev. Dr. J...