God promised Abraham and Sarah a child in their old age, and, despite their worldly attempts to bring about children on their own (possibly motivated by frustration, desperation or fear), God held true to His promise to them. Genesis chapter 21 shows Sarah giving birth to Isacc, with verse 2 specifying that she bore him "at the set time of which God had spoken to him" (NKJV). After being barren for so long, Sarah and Abraham were overjoyed with the blessing of their new baby, and in response to this they named him Isaac, which means "he laughs." Genesis 21:6 records Sarah saying "God has made me laugh, and all who hear will laugh with me" (NKJV). While it must be acknowledged that not all of Abraham and Sarah's actions or decisions were good ones, here we see at the very start of Isaac's life that they are properly responding to this blessing; not only rejoicing personally, but also glorifying God, recognizing His might and power at work, and making it known that He is the author and source of their happiness, as opposed to glorifying themselves or their own efforts.