A society, a family or an individual full of resentments prevents development towards a higher sphere.

This phrase brings us back to the fundamental value of Evolution.
We often mistake resentment for a form of justice. We hold onto old offenses, thinking that by staying angry, we are punishing those who hurt us or "keeping the score." Whether it is a person holding a grudge against an ex-partner, a family divided by a feud, or a nation obsessed with past wars, we believe our anger protects us. But this quote reveals a physical law of the spirit: You cannot rise if you are weighed down.
Here is why resentment is the primary obstacle to reaching your potential:
The Anchor Effect: Imagine trying to climb a mountain while dragging a bag of heavy rocks behind you. That is resentment. Every grudge you hold is a rock. It doesn't make the climb impossible, but it makes it infinitely harder and slower. To reach a "higher sphere" (peace, success, enlightenment), you must travel light.
The Poisoned Vessel: There is a famous saying that resentment is like drinking poison and waiting for the other person to die. It corrodes the container it is kept in. A family full of resentment cannot foster love; a society full of resentment cannot foster innovation or cooperation. The energy used to hate is energy stolen from creating.
Looking Backward vs. Moving Forward: You cannot walk toward the future while looking over your shoulder at the past. Resentment locks your focus on what was, preventing you from seeing what could be. Development requires vision, and resentment blinds you.
The golden rule: "To heal a wound, you must stop touching it."
Forgiveness is not about condoning what happened; it is about deciding that you will no longer let the past control your present. It is an act of selfishness in the best possible way: you set yourself free.
As Nelson Mandela wisely said: "As I walked out the door toward the gate that would lead to my freedom, I knew if I didn't leave my bitterness and hatred behind, I'd still be in prison."