"Father, everyone is looking for happiness. But what is meant by happiness?" This was one of the questions a wise boy in India, Sveta-ketu, put to his father many centuries ago.
"Son, one of the signs of happiness, is that a person who has it becomes active in life. A person who does not find happiness does not feel like being active in life. His mind is cramped, his will is weak. What is vast and infinite brings happiness. There is no true joy in what is small or finite. I can tell you that the Infinite alone is happiness; but you must desire to understand this Infinite, my son."
"I want to understand it, Father," said Sveta-ketu.
"Good," said his father. "Then you must listen carefully to what I say and think deeply about it:
"When a person sees that Brahmn/God pervading everywhere and that no one is separate from Him, that he is one with all the people, animals, and objects in the universe, when a person sees and hears and knows nothing else -- that is the Infinite.
"But, if one sees or feels some other thing, obstructing him, separating him, then that is the finite. He has not yet found the Infinite.
"The Infinite never passes away; it lasts forever; but what is finite will pass away."
In the above story, father is teaching his son to realize that he is a soul & that soul is present in everyone & everywhere. This infinite Super Soul is called Brahmn. God himself is called Brahmn. Whole world dwells in Brahmn. Whole world comes from Brahmn. Whole world goes back in Brahmn. Whole world breathes in Brahmn. Let's worship that Brahmn, the God. Finding & realizing one's identity with the infinite Super Soul is finding the real happiness.
Below are few verses of Bhagwat Gita where God is also telling of His nature to be as described above only:
"maya tatam idam sarvam
na chaham tesv avasthitah" (Bhagwat Gita: Chapter Nine verse 4)
"Sri Krishna said: By Me, in My unmanifested form, this entire universe is pervaded. All beings are in Me, but I am not in them."
vayuh sarvatra-go mahan
tatha sarvani bhutani
mat-sthanity upadharaya" (Bhagwat Gita: Chapter Nine verse 6)
"Sri Krishna said: Understand that as the mighty wind, blowing everywhere, rests always in the sky, all created beings rest in Me."
"prakritim svam avastabhya
visrijami punah punah
bhuta-gramam imam krtsnam
avasam prakriter vasat" (Bhagwat Gita: Chapter Nine verse 8)
"Sri Krishna said: The whole cosmic order is under Me. Under My will it is automatically manifested again and again, and under My will it is annihilated at the end."
"aham atma gudakesha
aham adis cha madhyam cha
bhutanam anta eva cha" (Bhagwat Gita: Chapter Ten verse 20)
"Sri Krishna said: I am the Super Soul, O Arjuna, seated in the hearts of all living entities. I am the beginning, the middle and the end of all beings.