It is perishable any moment. It can live on without a limb or two but the moment the vital air stops its flow, it starts to decompose. Have your mind and its journeys always under control. Yoga is the parallel progress of the Jivatma, every step in tune with the Paramatma. In common parlance Vijnana is used to indicate the sciences but really it means the Higher Wisdom.
Wishes vitiate the mind.
Wishes lead to action, action leaves a scar, a Vasana on the Mind. Be alone with yourself and, then the mind can be negated. It is for this reason that Yogis retire into caves. Beneficent Vasanas help liberation. Japa, Dhyana, Good Works, Charity, Justice, Unselfish Service, Fortitude, Compassion - these are all beneficent.