Please don't confuse "meditation" with the Eastern mystical concept of Transcendental Meditation (or TM).
TM is a practice designed to help the mind empty itself of conscious content.
By contrast, biblical meditation (of the kind praised and cherished in Psalm 1) is meditation on the word of God. It is easy to read, understand and forget the word of God. Turning the truths of Scripture over in our minds, dwelling on their application, picturing life if these truths were consistently lived out, and picturing life when these truths are ignored are processes that help God's word sink deep in our hearts and change us.