"Single-pointed concentration [samadhi] is a meditative power that is useful in either of these two types of meditation. However, in order to develop samadhi itself we must cultivate principally concentration meditation. In terms of practice, this means that we must choose an object of concentration and then meditate single-pointedly on it every day until the power of samadhi is attained. The five great obstacles to samadhi are laziness; forgetfulness; mental wandering and depression; failure to correct any of the above problems when they arise; and applying meditative opponents to problems that are not there, that is, they are purely imaginary." Läs hela artikeln här: http://www.lamayeshe.com/article/developing-single-pointed-concentration