Christians are beneficiaries of the blessing of Abraham. On accepting Jesus' death on our behalf we were put into a New Covenant with God which is totally different to the Law Covenant that the Children of Israel brought on themselves. As Christians we belong to a better covenant which is built on better promises.

Galatians 3:11  Now it is evident that no one is justified before God by the law, for "The righteous shall live by faith." 12   But the law is not of faith, rather "The one who does them shall live by them."  13  Christ redeemed us from the curse of the law by becoming a curse for us--for it is written, "Cursed is everyone who is hanged on a tree"-- 14  so that in Christ Jesus the blessing of Abraham might come to the Gentiles, so that we might receive the promised Spirit through faith. 

Because we have thrown ourselves on God's mercy and accepted Jesus' sacrifice for sin we have been justified, not by works of the Law, but by faith in Jesus.

And so we have received the blessing of Abraham and have been given the promised Spirit, the Holy Spirit, through faith.

Romans 15:13  May the God of hope fill you with all joy and peace in believing, so that by the power of the Holy Spirit you may abound in hope.

The Holy Spirit is the Spirit of power. He empowers us and fills us with joy and peace and hope on believing in Jesus. These things are all fruit that Holy Spirit will bring out in us if we let him. They're part of the blessing.

Acts 1:8 But you will receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem and in all Judea and Samaria, and to the end of the earth."

What God can do through us is simply breath-taking. The power is in us by the Holy Spirit to do all things through Christ who strengthens us. God has blessed us to be a blessing, and all the things He blessed Abraham with can be ours if we put God first.