The importance of meditation
The Lord is attained without the least effort; he is worshipped by self-realisation alone. … The self is not realised by any other means other than meditation. If one is able to meditate even for thirteen seconds, even if one is ignorant one attains the merit of giving away a cow in charity. If one does so for one hundred and one seconds, the merit is that of performing a sacred rite. If the duration is twelve minutes, the merit is a thousandfold. If the duration is of a day, one dwells in the highest realm. This is the supreme yoga, this is the supreme kriyā.
— Yoga Vāsiṣṭha (tr. by Swami Venkatesananda p. 255)
What is meditation?
Meditation is not a practice; it is not the cultivation of habit; meditation is heightened awareness. Mere practice dulls the mind. heart for habit denotes thoughtlessness and causes insensitivity. Right meditation is a liberative process, a creative self-discover which frees thought-feeling from bondage. In freedom alone is there the Real.
— J. Krishnamurti (source)
Meditation doesn’t imply merely sitting in a posture with eyes closed. Meditation, in essence, means heightened awareness, being intensely aware of the present moment. This heightened awareness comes about only when you are not making any effort. It comes about with the acceptance and awareness of the present moment as it is. If you are in such a state of pure awareness, you are in meditation irrespective of what you are doing. In Yoga Vasishta it is said that, “While doing whatever one is doing — seeing, hearing, touching, smelling, eating, moving, sleeping, breathing, or talking — one should realise one’s essential nature as pure consciousness. Thus does one attain liberation.”
Of course, if you think that sitting in a posture with eyes closed helps you get to the state of heightened awareness, you can definitely practice that.
How to meditate?
When you sit down to meditate, tell yourself that at this time “I want nothing”. The second is to tell yourself “I do nothing”. The third sutra (principle) is “I am nothing”. Do not think that you have to meditate, just sit and be hollow and empty. You do not have to make any kind of attempt. These three sutras are very important.
— Sri Sri Ravi Shankar (source)