"I will make you into a great nation, and I will bless you; I will make your name great, and you will be a blessing." (Genesis 12:2)
The LORD said to Abram: go from your country, your people, and your father's household to the land I will show you. The call is built on four separations: land, people, household, and the past itself. God does not give Abram a destination; he gives a direction. Go. The land will be shown along the way. The Catechism identifies this as the defining structure of all faith: obedience to a call whose full destination is not yet visible, sustained by the word of the one who calls (CCC 145). Abram is seventy-five years old. He goes.
The promise attached to the call is threefold and universal in scope: I will make you into a great nation, and I will bless you; I will make your name great, and you will be a blessing. I will bless those who bless you, and whoever curses you I will curse; and all peoples on earth will be blessed through you. Abram's call is not for Abram's benefit alone. It is the beginning of God's answer to the curse of Babel: through this one man and his descendants, all the families of the earth will receive blessing. St. Paul will argue in Galatians 3 that this promise is fulfilled in Christ, the seed of Abraham in whom all nations are blessed.
Abram travels through Canaan to Shechem, where God promises to give this land to his offspring. Abram builds an altar. He moves to the hills east of Bethel and builds another altar. A famine drives him to Egypt, where he deceives Pharaoh about Sarai, nearly losing her to the Egyptian court. God afflicts Pharaoh's household and the truth comes out. Abram is expelled from Egypt, but he leaves with great wealth.
Brothers and sisters, Abram left without knowing where he was going. He went on the word alone. Every step of faith in your own life that has required leaving something behind before the destination was clear is participation in the obedience of Abraham. The destination is always shown along the way, never in advance. Trust the one who calls and begin to move.
Lord God, you called Abram from his country and his people with a promise of blessing for all nations. Call us from whatever keeps us from going where you lead. Let us be blessed and be a blessing. And fulfil in us the promise you made to Abraham, which is yes and amen in Christ Jesus. Through Christ our Lord. Amen.