In both Buddhist and Christian traditions, the concept of purifying or mitigating the effects of bad karma (or sin, in Christian terms) is a profound process that involves deep introspection, genuine remorse, and a sincere commitment to transformation. To address the effects of bad karma through a process of purification, one can follow these steps:

1. Recognition: The first step is the honest acknowledgment of one's harmful actions. This recognition is not just an intellectual understanding but a deep seeing into the nature of the deeds and their impact on others and oneself. It involves a clear perception of how these actions are entangled in the cycle of karma. In Christianity, this parallels the concept of confessing one's sins, recognizing the moral and spiritual implications of one's actions.
2. Regret: This step goes beyond mere acknowledgment. It involves feeling genuine remorse for the harm caused. This is not about self-flagellation or guilt, but a heartfelt response to the suffering one's actions have caused. In Buddhism, this remorse is seen as a crucial part of purifying karma. Similarly, in Christian teachings, contrition or sincere sorrow for sins is vital for forgiveness and redemption.
3. Restitution: This step involves making amends for the wrongs done, as far as possible. In Buddhism, this might include apologies, reparative actions, or other ways of directly addressing the harm caused. In Christianity, this is akin to the concept of penance – making amends and rectifying the wrongs done wherever possible.
4. Resolution Not to Repeat: Central to this process is a firm resolution not to repeat the harmful actions. This involves a deep commitment to change and an understanding of the causes and conditions that led to the negative behavior. In both traditions, this step is about transforming one’s behavior and thought patterns to prevent future harm.
5. Reformation: This final step is the ongoing process of ethical and spiritual development. In Buddhism, this involves cultivating positive qualities and actions that counteract the negative karma. Practices like meditation, mindfulness, and compassion play a significant role here. In Christian practice, this is akin to living a life in accordance with Christian virtues and teachings, continually seeking to grow in faith and love.

Through these steps, one engages in a transformative process that not only addresses past negative actions but also fosters a profound inner change, leading to a more compassionate, wise, and ethical way of living. This aligns with the Buddhist path of liberation and the Christian journey towards spiritual maturity and closeness with the Divine.