If we let our personal genetic steersman have his way, we shall tend to follow a course laid down for us in our DNA. But if much of what is inherited consists of behaviour tendencies that can be resisted, modified and shaped, there is a real possibility for intervention, for countermanding the genetic steersman.
Particularly interesting as Lykken (and Tellegen) are often quoted as saying
"trying to be happier [may be] as futile as trying to be taller"
(Lykken D, Tellegen A. Happiness is a stochastic phenomenon. Psychological Science. 1996;7:186–189.)