A person can make himself happy, or miserable, regardless of what is actually happening 'outside,' just by changing the contents of consciousness.
Mihaly CsikszentmihalyiIt is amazing how little effort most people make to improve control of their attention. If reading a book seems too difficult, instead of sharpening concentration we tend to set it aside and instead turn on the television, which not only requires minimal attention, but in fact tends to diffuse what little it commands with choppy editing, commercial interruptions, and generally inane content.
Mihaly Csikszentmihalyi