You know that what you need to do is possible to do, even though difficult, and sense of time disappears. You forget yourself. You feel part of something larger.

Source: "Flow, the Secret to Happiness." TED2004. Feb 2004. Conference Presentation. Additional Information: This quote, from psychologist Mihaly Csikszentmihalyi's 2004 TED Talk, is about the concept of "flow." Flow, explains Csikszentmihalyi, is a feeling in which one is completely engaged in what they are doing, so engaged that they lose their self-consciousness and sense of time. Not only is this state of being how people accomplish great things, but it is the key to happiness, says Csikszentmihalyi. Watch the full TED Talk here: Mihaly Csikszentmihalyi - Flow, the Secret to Happiness

“Flow, the Secret to Happiness.” TED2004. Feb 2004. Conference Presentation.