Effortlessness means not doing anything, inactivity - AKARMA. Effort means doing much, activity - KARMA. Both have to be there. Do much, but don`t be a doer - then you achieve both. Move in the world, but don`t be a part of it. Live in the world, but don`t let the world live in you. Then the contradiction has been absorbed. Then you are not rejecting anything, not denying anything. Then the whole God has been accepted.
From the scientific view, the theory of karma may be a metaphysical assumption -- but it is no more so than the assumption that all of life is material and originated out of pure chance
The Buddhist, who thanks no man, who says "Do not flatter your benefactors," but who, in his conviction that every good deed can by no possibility escape its reward, will not deceive the benefactor by pretending that he has done more than he should, is a Transcendentalist.
Every act of charity, every thought of sympathy, every action of help, every good deed, is taking so much of self-importance away from our little selves and making us think of ourselves as the lowest and the least, and, therefore, it is all good. Here we find that Jnâna, Bhakti, and Karma - all come to one point.