So Hagar bore Abram a son, and Abram gave the name Ishmael

Genesis 16:1-16
Now Sarai, Abram’s wife, had borne him no children. But she had an Egyptian slave named Hagar; so she said to Abram, “The Lord has kept me from having children. Go, sleep with my slave; perhaps I can build a family through her.” Abram agreed to what Sarai said. 3 So after Abram had been living in Canaan ten years, Sarai his wife took her Egyptian slave Hagar and gave her to her husband to be his wife. He slept with Hagar, and she conceived.
Then the angel of the Lord told her, “Go back to your mistress and submit to her.” The angel added, “I will increase your descendants so much that they will be too numerous to count.”
So Hagar bore Abram a son, and Abram gave the name Ishmael to the son she had borne. Abram was eighty-six years old when Hagar bore him Ishmael.
Saral devises her own way of making God's promise come true. Childless herself, she falls back on custom, giving her slave-girl to Abram. But human emotions in such a situation are complex and the unhappy sequel is not surprising.
Why?
Abram and Sarai used their way and mind to respond to God's promise. They made their own decision but it causes this family unhappy.
God's promise will be done but we need to wait and endure some difficult situation.
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信心需要去操練，經歷。
亞伯拉罕信心脆弱，需要幫忙他。他一直沒有兒子是他信心最弱地方。他一直在降低應許的強度。神說從你所生的，沒有說從那個女人生的。從夏甲生也算是我的兒子。亞伯蘭在迦南那裏已經十年，生以實馬利，已經86歲，表達10年沒有顯示應許實現的徵兆，愈來愈不可能實現，這表示這才是神應許的實現。這件事他真的做錯了。直到他獻兒子以撒時信心真正成熟。
整個事件的發動增者看來是撒來的主意，看來是神使我不生，好像要幫忙神讓應許實現。神不建立我，我自己想辦法。想要被建立，結果反而被渺視，連自己的下女都看不起她。此時才想起神，當神不如我意時，我自己處理。不要干涉我的心態。直到搞垮了才求神來解決。撒萊正如許多基督徒的想法。
夏甲是最有信心的人，唯一錯的是小看自己的主人。神要她回去撒萊回去，回去是忍氣吞聲，很不容易，僕人逃跑回去有可能被殺。神並且給她應許。神要她伏在撒萊的手下，是最順服的且有信心的顯現，（連怪怪癖的也要順服）。她會有兒子，表示她會安全的、平安的。
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How?
Be patient, for God's promise and blessing will come true. God's word never fails. God is always with us when we walk in God's way and trust in Him.