How to make good habit??

I think that I remember reading somewhere that in order to make something a habit, you need to consistently do it for 2 weeks, or 14 days, and it just sort of becomes a habit after that. I am not sure if it is true or not. But I figure if you are able to remember to do something every day for that long, you probably don't have to think about doing it for it to just come naturally, so I suppose it makes sense.

Must cultivate the good habits. To cultivate it, must think good, when we think good, good talks will flow, in turn good talks will make us to do good things.