The whole Duty of Man is summed up in Obedience to God's Will
Genesis 22:1-19 (NKJV)
When Abraham was 75 years old, he received a promise from God that he would become a great nation. His wife was sterile and also very old like him. Twenty-five years later Sarah, who was sterile gave birth a son who Abraham called Isaac. God never forget His promise as Abraham was 100 years old when he became a father. Whenever God says: “-I will do it!”, He does it. Abraham lived 175 years and Sarah 127. Both of them saw God’s promises fulfilled in their lives because they just believed.
Before we consider anything, we must know two important principles:
# God tests someone who He loves
# He always requires from us valuable things