The ancient Greeks believed that there were virtues, or habits, that one could learn that would lead, if fate allowed, to a happier life
It was recognized that we humans are a mass of swarming desires, and that trying to control all these desires, each wanting to go in its own direction, was a lot like herding cats. Each of these desires seemed to have two contradictory extremes, going too far in one direction or the other. They saw the attempt to totally eliminate a desire as bad
for someone as if they gave in totally to that desire. As if a desire
were a wolf that you were starving, eventually it will break free and be
totally out of control until it is satiated. It was noted that people who allow their desires to lead them to one extreme or the other are the most miserable people alive, and appear to have no control over what happens in their lives.
A virtue is the habit of seeking a balance between two extremes of a desire, such as hunger balanced between starvation and gluttony, or love balanced between madness and the total lack thereof, the desire to drink and go to parties should balance between being out of control and staying in every night. Given anything with two extremes one should always seek the middle path, one should seek balance. Moderation in all things, abstinence only in those things that would instantly poison your reason or your body.
The Greeks saw that we should seek balance among all the virtues, our
job should balance perfectly against family obligations,
finances balanced against the desire for more stuff, and so on. By consistently choosing the middle path using the rational mind, not starving or overfeeding any one desire at the expense of all the others, we would build up the habits that would lead to success in every area of life and allow us to seek fulfilment. Over time our desires will become used to the caring concern that your rational mind tends to them all, and fall into line, not raging to be in control all the time, and not withered away and starving.