"Between those two, practice (abhyasa) and dispassion (vairagya), the endeavor towards stillness and stability (sthiti) of the mind-field is called practice." Swami Veda Bharati.
Explanation: The mind does not become stable and calm by mere choice or by wishful thinking. It takes effort to purify the emotions, reduce agitation, and train the mind to be one-pointed. The action and effort made to calm the mind and make it steady, calm, and stable is called abhyasa, practice. The greater the energy, devotion, and enthusiam in the effort, the sooner will the practice be established and the goal reached.