Saint Paul wrote in his letter " By faith also Sara herself, being barren, received strength to conceive seed, even past the time of age; because she believed that he was faithful who had promised,"
Father God gifted Child to Barren Sarah and Prophet Abraham, Holy Time pleased the Prophet Abraham because Prophet Abraham became father, Holy Time pleased the Prophet Abraham's Wife Sarah because Sarah became Mother. There are different types of Happiness in the Fatherhood and Motherhood. No Happiness is greater than the Happiness of becoming 'fatherhood and motherhood'. Creator of Time brought Good Time in the Life of 'Prophet Abraham and Prophet Abraham's wife Sarah'. Creator of Word himself blessed the Prophet Abraham for Fatherhood.
Genesis 21:1
The LORD blessed Sarah, as he had promised,
Genesis 21:2
Sarah conceived and gave birth to a son for Abraham in his old age, at the very time that God had told him.
[Douay - Rheims Catholic Bible ]
Hebrews 11:11
11. By faith also Sara herself, being barren, received strength to conceive seed, even past the time of age; because she believed that he was faithful who had promised,
[The Miraculous Pawan Upadhyay Bible and The Miraculous Prayers by The Miraculous Writer Pawan Upadhyay (Miracles Since Year 2003).]