As the practices of Karma Yoga take hold, they inevitably lead to a deep devotion and sense of consecration that brings the Yoga of Love to its fulfilment. Sri Aurobindo points out: “…even if such a discipline is begun without devotion, it leads straight and inevitably towards the highest devotion possible; for it must deepen naturally into the completest adoration inaginable, the most profound God-love. There is bound up with it a growing sense of the Divine in all things, a deepening communion with the Divine in all our thought, will and action and at every moment of our lives, a more and more moved consecration to the Divine of the totality of our being.”
“The seeker who puts them into living practice makes in himself continually a constant, active and effective representation of the very spirit of self-devotion, and it is inevitable that out of it there should emerge the most engrossing worship of the Highest to whom is given this service. An absorbing love for the Divine Presence to whom he feels an always more intimate closeness, grows upon the consecrated worker. And with it is born or in it is contained a universal love too for all these beings, living forms and creatures that are habitations of the Divine–not the brief restless grasping emotions of division, but the settled selfless love that is the deeper vibration of oneness. In all the seeker begins to meet the one Object of his adoration and service.”
We can see that for those who sincerely take up the Yoga of works, the result eventually integrates the Yoga of love and devotion. The two paths, while they start from different aspects of the human nature, interweave and eventually join fully as the realisations deepen.
Sri Aurobindo, The Synthesis of Yoga, Part One: The Yoga of Divine Works, Chapter 4, The Sacrifice, The Triune Path and the Lord of the Sacrifice, pp. 103-104