"Let not world-objects be your mind’s master. Let them be, if at all, subservient to the mind. To be spiritual is not to look for one’s delight and fulfillment in the objects of the world. The mind that causes delight through any object can also provide delight without such an object. Delight in reality belongs to the mind alone. It is verily mind’s own gift."
The Guiding force of Narayanashrama Tapovanam & Center for Inner Resources Development
Sanskrit: साधना; a sādhaka (spiritual aspirant) undertakes a pursuit (sādhanā) to attain the fruition (siddhi's). Generally speaking sādhanā is a discipline or dedicated effort undertaken in the pursuit of a goal, liberation in this case.