Whatever an enemy may do to an enemy, whatever a hater may do to a hater, the harm caused by a misdirected mind is even greater stilt.
                                          -The Dhammapada
0.. an ill-directed, ill-controlled thought does more harm than an enemy can do to an enemy or a hater to a hater. That is to say, even those who have the best intentions in the world, if they do not have a wise control over their thought, will do more harm to themselves and to those whom they love than an enemy can do to an enemy or a hater to a hater.

                                                        The Mother 

...one is surrounded by what one thinks about. You understand quite well what this means? (Turning to a child) Every time you think of something, it is as though you had a magnet in your hand and were attracting that thing towards yourself - you understand. Now, there are people who have a very, very bad habit of always thinking about all possible catastrophes, and are in a sort of constant apprehension about some calamity befalling them the next moment. I know many like that, there are some here. And so, those people have as though a magnet in their hands to attract calamities, not only upon themselves but upon others also. That lays a big responsibility upon them. And if one can't stop all the time from thinking about something - some have ahead that runs on and they haven't found away of stopping it- well, why not make it run on the right lines instead of letting it run on the others! Once your head begins to run, let it run on all the good things that can happen. If it is obliged to turn round and round, well, turn then to the good side! That is, if somebody is ill, instead of saying: "What is going to happen, perhaps this is going to be very serious, and if it is that disease.. and a calamity comes so quickly", instead of all that, if one thinks: "Oh! that is nothing, illnesses are outer illusions translating some deeper vibrations which are not seen, that is why one doesn't speak about them, but that's how it is. And these deeper vibrations may come and set in order what has been disturbed. And this imbalance, this illness or bad thing that has come, well, it will be absorbed by the Grace and will disappear, no trace of it will remain, except that of things agreeable and pleasant." One may continue to think in this way uninterruptedly People always need to make their mind run, run, run, but then make it run on the right lines, you will see that it has an effect. For instance, let it go like this: that I shall learn better and better, shall know better and better, become healthier and healthier, and all difficulties will vanish, and wicked people will become sweet and good, and ill people will be cured, and houses which should be built will be built, and those things which should disappear will disappear, but giving place to better things, and the world will move in a constant progress, and at the end of that progress there will be a total harmony, and so on, and continue thus You can go on endlessly. But then you will have around you and around your head all kinds of pretty things. Those who perceive the atmosphere see certain inky stains, like an octopus there, yes, like that, with its tentacles to try and upset your mind -instead of that, one will see happy formations, formations of light or rays of sunlight or perhaps beautiful pictures, all that. One will see beautiful things -there are painters who do that and they always catch thoughts.

  The Mother