From bro. Zac's book -
Gaining God's Approval
When Abraham was 75 years old, God had called him to leave his hometown and his relatives in Ur of the Chaldees and to step out in faith in God, into the unknown. That was the first test that he passed. It is not easy to make a break with father, mother, brothers and sisters etc., But until that umbilical cord that ties us to them is broken we can never be disciples of Jesus!
Jesus said, "If anyone comes to Me, and does not hate his own father and mother and wife and children and brothers and sisters, yes, and even his own life, he cannot be My disciple." (Lk.14:26).
Abraham obeyed God at once.
I have wondered what would have happened if Abraham had turned down God's call. God would certainly not have forced him. God would have found someone else; and we would never have heard of Abraham again. That someone else who responded to God would have become the father of faith and the ancestor of the Messiah! How much Abraham would have missed if he had failed in that first test!
Little did he realise when he stepped out of Ur, turning his back on the pleadings of his relatives, what a glorious future God had planned for him.
God still calls people, as He called Abraham. Little do those who are being called realise what great issues hang in the balance when they have heard the call of God. Church history, throughout these 20 centuries, is filled with the amazing stories of men and women who responded to God's call immediately, joyfully and wholeheartedly like Abraham and who fulfilled God's purposes.
Eternity alone will reveal however, how many others were also called, who did not respond and who wasted their lives. The rich young ruler who turned away from Jesus to embrace his money a little tighter, was but one among many who were called, but who made the wrong choice when tested.
Those whom God calls usually find that their first and greatest hindrance comes from their unconverted and carnal relatives. That was why Jesus spoke of `hating father and mother' as being the first condition of discipleship.
Abraham passed the test here - though not in one step. His father joined him on the journey out of Ur, but persuaded Abraham to stop at Haran (half-way to Canaan).
"Terah took Abram his son, and Lot the son of Haran, his grandson, and Sarai his daughter-in-law, his son Abram's wife; and they went out together from Ur of the Chaldeans in order to enter the land of Canaan; and they went as far as Haran, and settled there." (Gen.11:31).
God, in mercy, took away Abraham's father in death, so that Abraham might not be hindered any longer. Then Abraham moved on to Canaan.
We must never let our love for our relatives hinder us from God's purpose for our lives.