Dada Bhagwan said this quote

In the act of selfishness, you bind demerit karma and in the act of sacrificing your own self-interest for the sake of others [selflessness], you bind merit karma. Nevertheless, they are both karma, aren’t they? The fruit of merit karma is shackles of gold and fruit of demerit karma is shackles of iron but they are both indeed shackles, aren’t they?