Meditation means learning to control our minds, thereby protecting our minds from domination by delusion and other afflictions. We may think, “Oh, I wish my mind were not dominated by ignorance and other afflictions.” But these afflictions are very powerful and very destructive; they operate despite our wishes. We have to work to develop effective countermeasures. We cannot buy such remedies from a store; even very sophisticated machines cannot produce them for us. They are obtained only through mental effort, training the mind in meditation.
From From Here to Enlightenment by H.H. the Fourteenth Dalai Lama, page 69