Greetings and blessings to the entire @Steemchurch community. I can tell you that God is sovereign, and He does what He wants. No one instructed the mind of God, nor received order to do all the things he did. In the fullness of his sovereignty, God rules over all creation, and God sets the guidelines for the fulfillment of his will.

In Genesis 18: 1-15, God set the guidelines for promising Abraham a son through his wife Sarah. However, the word says that this caused laughter in Sara, because both Abraham and she were older and, besides Sara, the custom of women had ceased. Remember that God does what he wants.

In Sara's life, after hearing that promise from God, negative thoughts began to rumble in her mind that they were fulfilling the promise. Sara began to do things in her own way and not in God's way. Sara despaired, probably due to her advanced age and incredible sexual pleasure with her husband. In her hurry to give her husband Abraham a son, he finally handed her over to her servant Hagar to sleep with her husband Abraham and have the son God had apparently promised.

Sara kept doing things in her own way and not in God's way. When his servant Hagar had the son with Abraham, that is, Ishmael; Things became a test for Sara, who in her desperation to leave Ishmael and Hagar, asked Abraham to throw them out of the camp.

When we don't align with what God wants from us, we end up doing things completely bad and bad.
When the time came, Sara delighted with her husband Abraham and the result was the son of the promise, Isaac.
God does what he wants, for God there are no limitations, there is no influence on the age or physical wear of the human body. God is powerful to fulfill his plans. God does what he wants.