Same is case with God. No one knows how big, how powerful He is. Vedas, Puranas only tell & describe Him as per the knowledge these have but still no one can describe God in full, as He is beyond the knowledge of everyone. God is Infinite & incomprehensible.
God as infinite is limitless, Omnipresent & the one who fills this limitless space. Such an Infinite God exists everywhere & is not limited by time or space. In all the religions of the world God is designated as a singular, universal Supreme Being who encompasses all this creation. His all the attributes such as power, wisdom, love, compassion etc. are limitless & hence Infinite.
Bhagwat Gita describes the God as unborn, eternal, ever-existing, infinite and primeval. God is never born nor dies at any time. God is manifest & un-manifest both i.e. He is there before the creation & also present during the creation. He is omniscient (knows everything), omnipresent (who is present everywhere), omnipotent (who is having all the powers & is all powerful), imperishable & indestructible. He is invisible, inconceivable and immutable. He is having supernatural powers. He is Truth Absolute, Knowledge Absolute and is Infinite. He is everlasting; present everywhere, unchangeable, immovable and eternally the same. So are some of the qualities of God described.
Here below are few verses from Bhagwat Gita which describe about the infinite nature of God:
"sarvatah pani-padam tat
sarvatah shrutimal loke
sarvam avrtya tishthati" (Bhagwat Gita: Chapter Thirteen verse 14)
"Sri Krishna said: O Arjuna, Everywhere are His (God's) hands and feet, His eyes, heads and faces, and He has ears everywhere. In this way the Super Soul exists, pervading everything in this world."
"mattah parataram nanyat
kincid asti dhananjaya
mayi sarvam idam protam
sutre mani-gana iva" (Bhagwat Gita: Chapter Seven verse 7)
"Sri Krishna said: O Arjuna, there is nothing else besides Me in this world. Like clusters of yarn-beads formed by knots on a thread, all this world is threaded on me.
So let's pay our obeisance to such an Infinite God. Let's also think that God is always near to us & is always in our heart. Then He too shall never give you up or never depart. God is always with you & shall always be with you if you think Him to be supreme. So always have trust in your life that God is near you though He is present in all the creation.
Jai Sri Krishna