God focused on one man to bring to pass His promises.
“Now the Lord had said unto Abram, Get thee out of thy country, and from thy kindred, and from thy father’s house, unto a land that I will shew thee: And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing: And I will bless them that bless thee, and curse him that curseth thee: and in thee shall all families of the earth be blessed. So Abram departed, as the Lord had spoken unto him” (Genesis 12:1-4).
Five times in three verses we find the words bless, blessed, or blessing. We are blessed to be a blessing.
There are 7,487 promises in the Bible from God to man, and many of them are directed to us. Sadly, through ignorance, we live far below what God has in mind for us. We are the children of the promise (Romans 9:8; Galatians 4:28) and the heirs of promise (Hebrews 6:12, 17). It is our inheritance. God has many good things in mind for us. Some promises are conditional: they depend on our obedience for fulfillment. Others are unconditional.
Unfortunately, we often fail to take God at His word and do not believe Him to be powerful or sufficient enough to handle our problems. For the problems we encounter in life there are corresponding promises to overcome them.
“We sometimes denigrate Sarah for laughing at God. However, as incredible as it sounds, laughing at God is not that unusual. We in effect do the same thing every time we read God’s words and fail to put them into practice or hear his promises and decide not to believe them” (The Knowing Jesus Study Bible).