Use discipline to promote the cause of the soul. Use the same mind to accept that the experience of suffering is nothing more than an experience to learn. Spirituality, which is a science that explains the cause and effect relationship between soul and mind, has to be given due importance in our day to day life. And here, when we talk of impressions that we formed, consciously or unconsciously, knowingly or unknowingly, which go back, travel back through our unconsciousness to the soul, and come back as our reaction patterns when the environment presents itself, this gives the scientific basis of our existence. If we have to form such impressions which are to be conducive to that quality of the soul, then we have to think of that impression which is going to do that.
Meditation means to continuously think of something, or to rest upon one thought.
We have to pick a thought to mediate upon, which will be conducive to promoting that quality of that soul. So, this is where the scientific basis of the need to meditate comes from. Raja yoga meditation, which gives a lot of importance to the mind, says that you start meditating to become divine. That which becoming you don't regret, or becoming which there is no contradiction between what you have become and what the soul wants you to become. It is a progressive approach towards that retention of harmony, or that regaining of the integration of body, mind and soul.