What the data actually shows
A substantial body of research, including work by Everett Worthington and by Loren Toussaint and colleagues, links forgiveness to better mental health — lower anxiety, depression, and stress — and to some better physical-health markers. The effects are generally modest and correlational in much of the work, but the direction is fairly consistent across studies, and some intervention research suggests structured forgiveness work can actually shift these outcomes rather than merely correlate with them.
A commonly proposed mechanism is the reduction of rumination and chronic resentment. Holding onto an unresolved grievance tends to keep replaying it, which sustains stress responses over time; releasing the resentment appears to interrupt that loop. In this framing the benefit comes less from anything that happens to the other person and more from what stops happening inside the forgiver.
The definition is doing heavy lifting here, and the research is careful about it. Forgiveness in this work means letting go of resentment and the desire to retaliate — explicitly not excusing the harm, denying it mattered, forgetting it, reconciling, or remaining in an unsafe situation. Some studies also find that forgiveness pushed too early or under pressure can backfire, which is why researchers treat it as a process rather than a single decision or a thing one is obligated to perform.
Why this feels different from how it actually is
Forgiveness is widely framed as something you do for the other person — a gift, a letting-them-off-the-hook — which makes it feel unfair when you have been genuinely wronged. The research reframes it as primarily self-directed: the main beneficiary in the data is the forgiver, which is a very different proposition from absolving someone who does not deserve it.
It also gets conflated with reconciliation, excusing, or forgetting, and those conflations are exactly what make it feel impossible or even dangerous in serious cases. Releasing your own resentment is a separate act from re-entering a relationship or pretending the harm did not happen — you can do the first without ever doing the others.
And resentment can feel protective, as if holding onto it guards against being hurt again or honours the seriousness of what happened. Part of why letting go feels wrong is that it can seem like dropping your guard or minimising the wrong — even though, in the research, releasing resentment and staying clear-eyed about what happened are not in conflict.
Forgiveness in this research is releasing resentment for your own sake — not excusing, forgetting, reconciling, or staying in an unsafe situation.
What the research says to do about it
Where structured approaches have been studied, forgiveness tends to be treated as a gradual process rather than a one-off decision. Worthington's widely used REACH model is one such framework, walking through recalling the hurt honestly, building empathy or understanding where possible, and committing to release resentment over time — with the emphasis on it being for the forgiver's own benefit, not the offender's.
The research broadly favours acknowledging the harm fully before any letting-go — naming that it was real and that it mattered — rather than skipping to forgiveness. Approaches that honour the seriousness of the wrong, and that separate releasing resentment from reconciling, are the ones more consistent with healthy outcomes in the literature.
Working on reducing rumination is a closely related, well-supported lever, since chronic replaying of a grievance is part of what keeps it costly. To the extent that forgiveness helps, much of its value seems to come through quieting that loop — so anything that genuinely reduces the rumination tends to point in the same beneficial direction.
What the research says does not help
Forced or premature forgiveness does not help and may make things worse. Some research finds that forgiving under pressure, or before genuinely processing the harm, can backfire — for example by leaving anger unaddressed or, in ongoing relationships, by signalling that the behaviour is acceptable. Forgiveness performed as an obligation is not the version the benefits attach to.
Treating forgiveness as the same thing as reconciling, excusing, forgetting, or staying in a harmful situation is a category error the research is explicit about avoiding. You can release resentment for your own sake while keeping clear boundaries, ending contact, or fully holding the other person accountable — and in cases of ongoing harm, prioritising safety comes first.
Suppressing or 'just getting over' the hurt without actually acknowledging it tends not to deliver forgiveness's benefits and can resemble avoidance. The work suggests the harm generally needs to be faced honestly first; pretending it did not affect you is different from genuinely releasing resentment about it.
The benefit comes less from anything that happens to the other person and more from what stops happening inside the forgiver.
What this looks like in real life
Letting go without letting back in
You can release the resentment you carry about someone while keeping firm boundaries, ending contact, or holding them fully accountable — and, where there's ongoing harm, prioritising safety first. Forgiveness in this research is an internal act; it's a separate thing from reconciling or pretending the harm didn't matter. That's why you can get the benefit even with someone you'll never see again.
When 'forgive and move on' backfires
Pushed to forgive before genuinely processing what happened, a person can end up with the anger merely buried rather than released — and in an ongoing relationship, a premature forgiveness can signal the behaviour was acceptable. Forgiveness performed as an obligation is not the version the benefits attach to; the work treats it as a gradual process, not a single decision one is required to make.
Real numbers in context
This is an area where the honest move is to hedge: most of the evidence is correlational, effect sizes are generally modest, and forgiveness is hard to measure cleanly, so it would be misleading to attach a precise figure to 'how much forgiveness helps.' What the research supports is a consistent direction — forgiveness is associated with lower anxiety, depression, and stress, and with some better physical-health markers, plausibly by reducing rumination and chronic resentment.
The most important number-free point is the definition. The benefits in this research attach to forgiveness understood as releasing resentment for your own sake — not as excusing, forgetting, reconciling, or staying in an unsafe situation — and forced or premature forgiveness can backfire. Read that way, the finding is less a verdict that you should forgive and more an observation that, when it is genuine and unforced, letting go of resentment tends to be good for the person who does it.