"We are not God; we are ignorant. We don't know what will happen tomorrow. God does not tell us what he intends to do tomorrow or five years from now. Evidently God intends for us to live and act in ignorance and in uncertainty about the outcome of our actions.
He says to us, for example, in James 4:13–15,
Come now, you who say, "Today or tomorrow we will go into such and such a town and spend a year there and trade and get gain"; whereas you do not know about tomorrow. What is your life? For you are a mist that appears for a little time and then vanishes. Instead you ought to say, "If the Lord wills, we shall live and we shall do this or that."
You don't know if your heart will stop before this service is over. You don't know if some oncoming driver will swerve out of his lane and hit you head on as you go home. You don't know if the food in the restaurant may have some deadly virus in it. You don't know if a stroke may paralyze you before the week is out. You don't know if some man with a rifle will just start shooting at you at the Southdale Mall. We are not God. We do not know about tomorrow.
And therefore risk is built right into the fabric of our finite lives. You can't avoid risk even if you want to. Ignorance and uncertainty about tomorrow is our native air. All of our plans for tomorrow's activities can be shattered by a thousand unknowns whether we stay at home under the covers or ride the freeways.
... Safety
it's a mirage. It doesn't exist. Every direction you turn there are unknowns and things beyond your control.
And the tragedy is that in the deceptive enchantment of security (where we take risks for ourselves everyday without knowing it!) we are paralyzed to take any risks for the cause of God, because we are deluded and think it may jeopardize a security which in fact does not even exist."--JOHN PIPER
Read Risk and the Cause of God here