There are two ways in which a person may live. He may live by his own wisdom, talents, strength, ambitions, pleasures, plans for security and survival, or he may live from the words coming from the mouth of the Lord.
The Bible states that God finished His work from the beginning of the world. This means that during the six days of creation, every person, thing, and circumstance from the garden in Eden to the creation of the new earth and the coming down from Heaven of the new Jerusalem, the home of the Royal Priesthood was determined in advance.
Then God rested.
Everything was planned to the smallest detail. The animal and plant kingdoms. The destiny of each individual. The role of each individual, whether in the Kingdom of God or in the realms of darkness.
This does not seem possible until we regard seriously outer space and the bodies therein. If God through His Word can speak into existence such incomprehensible distances and masses, then it is conceivable that God can plan the future in detail.
Does this mean no matter what we do we are fated to arrive at a foreordained destiny? Not at all. The Scriptures, particularly in the New Testament, inform us that we can choose to obey God and our conscience, or we can give way to our sinful nature. The choice is up to each individual.
But the Scripture reveals also that God works in us to will and to do His good pleasure. So it is not a simple case of predestination, or our will, but a combination of the two working together in an inscrutable manner.