Patanjali's Yoga Sutra I:33

The Yoga Sutras of Patanjali are one of many ancient texts that teach us how and why we practice yoga. Whether you are interested in seriously committing to yoga or you just want more peace and joy in your life, it is recommended that you remember this one sutra. Sutra I-33, which says:
By cultivating attitudes of friendliness towards the happy, compassion for the unhappy, delight in the virtuous, and disregard towards the wicked, the mind-stuff retains its undisturbed calmness. ~Sutra I-33

It will be very helpful to you in keeping a peaceful mind in your daily life.

There are four kinds of locks in this world:
sukha (happy people)
dukha (unhappy people)
punya (the virtuous)
apunya (the wicked)

At any given moment, you can fit any person into one of these four categories.

Keep these four keys always with you and when you come across any one of the four locks you will have the proper key to open it.
friendliness
compassion
delight
disregard.

• Practice friendliness towards the happy. We can often tend towards judging or resenting happy people. Taking joy in someone else’s happiness is the opposite of jealousy. Jealousy comes out of a lack of trust; in the process of life, in your partner, in yourself. Lack of trust breeds insecurity, which creates jealousy; we stifle these feelings because they are uncomfortable. Through jealousy, you will not disturb the happy person but you disturb your own serenity.

• Practice compassion for the unhappy. There is a difference between compassion and pity. Pity pulls someone down, confirming their own unhappiness which pushes them down the drain even further. You make the belief of the person (who is suffering), about their sorrow, more concrete (in their sorrow) in whatever limited logic of their relative existence. At the same time we may feel like judging someone who is unhappy. Judgment says that that person should do something about their current situation and often times we think we know what they should do. Judgment can be disguised as being a good problem solver but do you truly know what is best for them. It can be challenging to show compassion when you feel that an unhappy  person is somewhat responsible for their own unhappiness but when you are judging someone you have no time to love them. Perhaps this person needs to suffer more in order to wake up and this is no small task to accept. And yet, consider the story of the lotus. In order for the lotus flower to bloom, it needs to grow in mud, the deeper and thicker the mud, the more beautiful the bloom. The only true way to help someone else is to empower them to help themselves. You don't empower people by throwing answers at them or by solving problems for them. You empower people by loving them. Holding space for them, allowing them to be seen and heard. When people are seen and heard, they can get in touch with the answers and clarity that already lives within them. Rumi says, "Close the language-door and open the love-window." a gentle reminder that compassion for others doesn't always involve tons of talking. "Close the language-door" might be the most poetic way ever of saying, "Shut your mouth."

Jack Kornfield reminds us -
"If your compassion does not include yourself, it is incomplete.”

• Practice delight in the virtuous. ‘Delight’ is such a beautiful word, full of warmth and charm. Is that what we associate with virtue? For many of us, acting virtuously has elements of struggling against our inclinations, being good when secretly we would prefer to be bad — or at any rate, slightly less good than we feel we ought to be. Virtue has a brisk, cold bath quality to it: it is good for us and for others, but it is difficult to convince ourselves that it is anything other than a trifle unpleasant. We are glad when we have been virtuous; actually being virtuous is less appealing. When you see a virtuous person it can be challenging to feel delighted. To find joy, delight in the virtuous means being humble and is a practice that will lead to humility. It means a reversal of values where self has to move from centre-stage; Love has to become all in all. So do not envy the person, but rather appreciate the virtuous qualities and try to cultivate them in your own life. As we rejoice in and appreciate their qualities, we are inspired by knowing such greatness is possible. Observing noble qualities in others is a virtue of the heart.

• Practice disregard (equanimity) towards the wicked (non-virtuous). The more we are surrounded by peaceful and wholesome people, the better we are able to share and grow with each other. It only stands to reason, then, that the people around you who do get caught up with the material and external world are those upon whom you want to impose your newfound knowledge. In other words, your friends and family members who are the most depressed, angry, and prone to stress are the people you will want to help the most. You will most likely discover that you're unsolicited advice, however, will be unwelcome and often met with resistance, if not anger and resentment. Disregard toward the wicked does not refer necessarily to the notion that anyone is inherently wicked or cruel. At any given point in time, in any given circumstance, each one of us has the potential to be happy, unhappy, virtuous, or wicked. This categorization refers mainly to the state of a person in a given moment. One could call on the key of disregard, then, when encountering a person who has a “bad attitude” and refuses to act in accordance with any activities considered peaceful, pleasant, or heartfelt. This is not so difficult when the wicked person is a stranger or someone we come across randomly, but when it happens to be a friend or family member, we feel a deep need to “show them the way”, teach them some yogic knowledge, and help heal their obviously suffering mind. But, if they are not aware of their suffering and prefer to exist in a place of angst and unrest (at least for the moment), your advice will be wasted and may even have a negative effect in the end. As Sri Swami Satchidananda writes in his translation of the Yoga Sutras, “Sometimes we come across such {wicked people} and if you advise them they take it as an insult. They think you are proud of your position. If you sense even a little of that tendency in somebody, stay away. He or she will have to learn by experience. By giving advice to such people, you will only lose your peace of mind.” The other person’s “peace of mind” is already lost, so in attempting to sway them to accept any truth other than that to which they already adhere only has the potential to disturb your own mind. As difficult as it may be, sometimes we have to recognize a situation such as this and accept the fact that maybe tomorrow the wickedness will have subsided and our advice may indeed be sought after. Until then, we must be content to meet these people with indifference in order to maintain our own steady mind because once that is lost, we can be of no help to anybody.