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.
The virtues we acquire, which develop slowly within us, are the invisible links that bind each one of our existences to the others - existences which the spirit alone remembers, for Matter has no memory for spiritual things.
I have this tattooed on my left side! I love the saying and it's a perfect description of Karma, don't judge/discriminate and don't do to someone what you wouldn't want done to you.