Of course, the greatest victory that the Spirit can give us is victory over ourselves. If we could be changed within, if all those destructive thoughts and habits within could somehow be dispelled, then we could handle our circumstances. Then we would be powerful indeed.
Dwight L. Moody once demonstrated the principle like this: "Tell me," he said to his audience, "how can I get the air out of the tumbler I have in my hand?" One man said, "Suck it out with a pump." The evangelist replied, "That would create a vacuum and shatter it." Finally, after many futile suggestions, Moody picked up a pitcher and filled the glass with water. "There," he said, "all the air is now removed." He then explained that victory for the child of God does not come by working hard to eliminate destructive thoughts and habits, but rather by allowing the Holy Spirit to take full possession.
So what are you troubled about? The future? God has it under His control. The past? Our sins have been thrown into the deepest regions of the sea by the death of Christ on the cross never to be retrieved. The present? There is a power that is available to all who would call on His name.