“I am Almighty God; walk before Me and be blameless.” (Gen 17:1)
Someone said, “Don't tell God that you have a big problem but say to the problem that you have a big God.” The God of impossibilities enabled Sarah to conceive a child when it was impossible to get at her age. God revealed Abraham as El Shaddai (the Almighty God), which means, "the all-powerful and all-sufficient God who can do anything and meet any need." Before making Abraham the "father of many nations", God asked him to "walk" and "be blameless". Indeed, Abraham fulfilled and walked upright before God.
A famous quote by William Carey says, "expect great things from God, attempt great things for God." As Abraham attempted great things for God, let us endeavor in our lives also, so that God blesses us beyond measure.