Building your concentration, the most important aspect of a good meditation, is like walking on water. But once you know where the stones are, it becomes a lot easier to do so. Concentration is focus with precision, one careful step at a time, one moment at a time. The only way to retain your concentration is by retaining it in this moment, the present moment, and then the next moment, and the next and so on. If you maintain the sharpness of your concentration from one moment to the next, you stand to gain extraordinary rewards from meditation.
In our current world where you have millions on websites and mobile apps, Facebook, WhatsApp, YouTube, Twitter and other distractions, achieving concentration is more difficult than it has ever been in the history of our race. Yet, if you wish to meditate, you have to go back to the basics, to an ancient lifestyle, frugal and simple. This lifestyle is not to be followed necessarily at all times (good if you do that though) but certainly while you meditate.
Becoming a good meditator requires great concentration and to become a great meditator requires supreme concentration. Concentration, especially one pointed concentration, comes with practice. Quality of practice leads to abundance of results. Please note the term “one pointed concentration”. This is the primary form of concentration we are concerned with.
Reference : A Million Thoughts. Om Swami.