Good is near Truth, but is not yet Truth. After learning not to be disturbed by evil, we have to learn not to be made happy by good. We must find that we are beyond both evil and good; we must study their adjustment and see that they are both necessary. The idea of dualism is from the ancient Persians. Really good and evil are one (Because they are both chains and products of Maya) and are in our own mind. When the mind is self-poised, neither good nor bad affects it. Be perfectly free; then neither can affect it, and we enjoy freedom and bliss. Evil is the iron chain, good is the gold one; both are chains. Be free, and know once for all that there is no chain for you. Lay hold of the golden chain to loosen the hold of the iron one, then throw both away. The thorn of evil is in our flesh; take another thorn from the same bush and extract the first thorn; then throw away both and be free. . . .
Swami Vivekananda