Delete the negative and accentuate the positive

When I was in college saw many friends start drinking and smoking just because some other friends did it,this led to their addiction that day I realized never to take a negativity even if it's from my best friend also take the positive behaviour of even your worst enemy.

Two stories each an allegory for why should we dissipate negativity and inculcate positivity

(1)There lived an old man in far land who used to meditate each morning

One morning, after he had finished his meditation, the old man opened his eyes and saw a scorpion floating helplessly in the water. As the scorpion was washed closer to the tree, the old man quickly stretched himself out on one of the long roots that branched out into the river and reached out to rescue the drowning creature. As soon as he touched it, the scorpion stung him. Instinctively the man withdrew his hand. A minute later, after he had regained his balance, he stretched himself out again on the roots to save the scorpion. This time the scorpion stung him so badly with its poisonous tail that his hand became swollen and bloody and his face contorted with pain.

At that moment, a passerby saw the old man stretched out on the roots struggling with the scorpion and shouted: "Hey, stupid old man, what's wrong with you? Only a fool would risk his life for the sake of an ugly, evil creature. Don't you know you could kill yourself trying to save that ungrateful scorpion?"

The old man turned his head. Looking into the stranger's eyes he said calmly, "My friend, just because it is the scorpion's nature to sting, that does not change my nature to save."

Clearly the old man didn't want to inculcate the negativities of scorpion in himself

(2)After the Battle of Lanka was over and their laid Ravana defeated counting his last breaths Rama asked Lakshman to learn from Politics,Philosphy and Kingship from Ravana. 

The story goes that after firing the fatal arrow on the battlefield of Lanka, Ram told his brother, Lakshman, “Go to Ravan quickly before he dies and request him to share whatever knowledge he can. A brute he may be, but he is also a great scholar.”  The obedient Lakshman rushed across the battlefield to Ravan’s side and whispered in his ears, “Demon-king, do not let your knowledge die with you. Share it with us and wash away your sins.”  Ravan responded by simply turning away. An angry Lakshman went back to Ram, “He is as arrogant as he always was, too proud to share anything.” Ram comforted his brother and asked him softly, “Where did you stand while asking Ravan for knowledge?” “Next to his head so that I hear what he had to say clearly.” Ram smiled, placed his bow on the ground and walked to where Ravan lay. Lakshman watched in astonishment as his divine brother knelt at Ravan’s feet. With palms joined, with extreme humility, Ram said, “Lord of Lanka, you abducted my wife, a terrible crime for which I have been forced to punish you. Now, you are no more my enemy. I bow to you and request you to share your wisdom with me. Please do that for if you die without doing so, all your wisdom will be lost forever to the world.” To Lakshman’s surprise, Ravan opened his eyes and raised his arms to salute Ram, “If only I had more time as your teacher than as your enemy. Standing at my feet as a student should, unlike your rude younger brother, you are a worthy recipient of my knowledge. I have very little time so I cannot share much but let me tell you one important lesson I have learnt in my life. Things that are bad for you seduce you easily; you run towards them impatiently. But things that are actually good for you, fail to attract you; you shun them creatively, finding powerful excuses to justify your procrastination. That is why I was impatient to abduct Sita but avoided meeting you. This is the wisdom of my life, Ram. My last words. I give it to you.” With these words, Ravan died.

Clearly even the lord himself wanted the whole world to know that one should take positives even of our worst enemies

Just keep in mind that you have to delete the negative and accentuate the positive from you.