Happiness

Do you want Happiness forever ?? 
then follow below advice from Sri Guru Granth Sahib ji :

ਜੇ ਲੋੜਹਿ ਸਦਾ ਸੁਖੁ ਭਾਈ ॥
Jae Lorrehi Sadhaa Sukh Bhaaee ||
If you long for eternal peace, O Siblings of Destiny,

ਸਾਧੂ ਸੰਗਤਿ ਗੁਰਹਿ ਬਤਾਈ ॥
Saadhhoo Sangath Gurehi Bathaaee ||
Then join the Saadh Sangat, 
the Company of the Holy; this is the Guru's advice.
ਅੰਗ ੧੧੮੨

Definition of Sadh Sangat:

ਸਤਸੰਗਤਿ ਕੈਸੀ ਜਾਣੀਐ ॥
Sathasangath Kaisee Jaaneeai ||
How is the Society of the Saints to be known?

ਜਿਥੈ ਏਕੋ ਨਾਮੁ ਵਖਾਣੀਐ ॥
Jithhai Eaeko Naam Vakhaaneeai ||
There, the Name of the One Lord is chanted.
ਅੰਗ 72