The believer who is assured of eternity looks at eternity positively. He sees eternity with confidence. Assurance is based on the work of Christ not on whether we deserve it. God provides eternity for us. If this is true, we should have no concern about the future in time or eternity.
Many people worry about the future.
Some people worry so much that it has become an occupational hazard. If people do not worry about themselves they worry about their children or grandchildren. That may be true. Worry always muddies the waters. Worry blinds us to solutions.