An Ishta-Devata is a chosen Deity over which one pours one s emotion and love and affection. Everything has a connection with everything else. There is nothing which is not internally related to the Almighty, the Supreme Being.
Every atom is so related, and every atom can be a teacher under given conditions.
We can touch God through every speck of space, because there is no such thing as a universe outside God. God is in everything that is experienced here as the world, or the universe, pervading and permeating all things, so that one cannot touch anything without touching God in some way. We see people changing their aims constantly. They cannot stick to any particular scripture, ideal or teacher. They cannot stick to a Mantra, cannot stick to a method, cannot stick to a place, cannot stick to anything.