TO LOVE AND BE LOVED: There are primarily two underlying forces in the universe indiscernible by ordinary sensual or modern scientific observation, namely the forces of karma (selfish exploitation of matter), and the force of bhakti (selfless loving service to God). That which is greater than us can’t be understood by force, but only by loving service. When you love someone or the Source of everything, they will be open to reveal all their secrets. There are many, many ways people have spoken about these two forces—or levels of understanding and their implications—according to their belief systems and goal of their lives.
One way of speaking about karma and bhakti is what the personified Vedas state in the 10th Canto of Shrimad Bhagavatam that there are two purposes of the material world: facilities for the living entity to enjoy their senses and mind in unlimited varieties, facilitated by new opportunities thru re-births and deaths to try again, and the higher facility for liberation through realizing one’s spiritual nature and the source of real happiness within. Ultimately, in its highest reach, my understanding is that this culminates in bhakti or loving devotion to various forms of God, for Gaudiya Vaishnavas, Radha and Krishna, or Shri Chaitanya and Nitai, etc. We are sparks of divinity meant to live in relationship to it and under its shelter.
In the lower stages of bhakti we are continually confronted, at times assaulted or harassed it can seem, with the choice to follow the ways of the world through material enjoyment or to engage in acts favorable for spiritual advancement in bhakti. We can call these two endeavors, the path of darkness and bondage, or the path of light and liberation.