If a person wishes evil to another, will karma return that desired evil to others? Or are these myths?

Whatever one does will come back to them!

The slightest misery one gives to any living being does return back to him - such is the law of Nature! What you sow is what you reap. So, the evil a person wishes for another will definitely return back to him. This is not a myth; the law of karma is very precise and exact. No one in this world can escape the fruits of one’s own karma.

People end up doing evil as they are not aware of the consequences they’ll have to face in retu

Therefore, satsang (the company of Gnani, the Enlightened One) is very important, where we get to learn the right things and develop right understanding. https://www.dadabhagwan.tv/beginnerssatsang/ is a good point to start in this direction.

In case the mistake is already done, what is the redressal now?

When our intentions are evil or not so good, we are sowing demerit (bad) karmas, as a consequence of which, we experience great difficulties in worldly life, and in the next birth, are reborn in the lower life-form. However, if we change our intention from bad to good, it impacts the charging of new karmas accordingly.

1. If one repents for his mistakes whole-heartedly before God, that karma becomes very light.

Any evil, if not repented for, is inevitably punished by the impeccable law of Nature. Therefore, Param Pujya Dadashri advises…

“You should keep doing pratikraman. The amount of pratikraman that you do should be equal to the pain you caused him (by wishing evil of his). If you do pratikraman for any of your actions, seventy-five percent of the effect of that act is dissolved. The other twenty-five percent remains like a burnt rope (has lost its strength to give any major effect); in the next life, it will disintegrate easily. By doing pratikraman, karmas shed off (easily) in the next life.”

Pratikraman means to apologize for one’s mistake before God with a sincere repentance in the heart for whatever wrong one has wished or done for another, and take a vow to never do this mistake again.

2. Our intent should always be that of not hurting any living being.

So, daily morning, we may say and repeat the following prayer at least 5 times before we start our day, “Oh God, May I not cause the slightest hurt to anyone through my thoughts, my words or my actions.”

3. Understand the theory of karma deeply.

Good and bad deeds are both effects of karma. But whenever we become the doer of the deeds, we bind karma. Doing good deeds, we bind new good karmas, and due to bad deeds, we end up binding new bad karmas. And with Atma Gnan (knowledge of our real Self), we are freed from that doership; so we stop binding new karma altogether. This is called Self-Realization, which happens only when Gnani, the Enlightened One, makes us aware of our own pure Self!!! To read more on this, one may visit https://www.dadabhagwan.org/self-realization/

When we go to Gnani and receive from Him Self-realization, Gnani releases us from all the doership and we stop binding new karmas!!! Thereafter, the effects (fruits) of the old karmas remain. And when all the effects have been completely experienced, we attain liberation...

“If humans could understand the principle of karma, they would understand the principle of liberation.”

~ Param Pujya Dada Bhagwan