God said the the just shall walk and live by faith. Abraham believed God and his belief, his faith justified him before God.
Abraham's faith was visible, it was an action. When God said get up and go, he went, not knowing where he was even going.
When God promised Abraham a son, he believed God, even though he and Sarah were past the age of child baring.
When God said take your son and sacrifice him to me, Abraham set out knowing that even if his son died God would raise him up again.
Faith has two aspects: believing and doing.
Today, believe what God said and begin to act as if it were true!