God is spirit so we cannot see Him or touch Him, but He is always with us. This he promised us. He will never abandon us. It is us who sometimes choose to abandon Him, but even when we do He is still with us because He cannot ever go against His promise and abandon us.
"God is spirit, and his worshipers must worship in spirit and in truth."
John 4:24
" As I was with Moses, so I will be with you; I will never leave you nor forsake you."
Joshua 1:5
"... because God has said, "Never will I leave you; never will I forsake you."
Hebrews 13:5