Jesus makes this statement - seemingly to the very crowd that was gathered to watch the woman caught in adultery be stoned.
Jesus made this statement more in the book of John than any other - and it's particularly stark on the heals of the account communicated in the first eleven verses of John 8.
The Pharisees shouted back "You can't testify about yourself!" - and Jesus comes right back at them with the cryptic answer of "I can testify about myself because I know where I'm from and where I'm going"
What isn't cryptic though is that He surely did shed light on the people living on the earth with Him in the first century. Jesus had a knack for taking the brutish, harsh realities of life and - yes - shedding the bright light of the noon-day sun on them - not just once - but over and over. If He'd only done it once - we could suspect it was an accident or happenstance. But it is His way. It's a hallmark of the Kingdom for Jesus' presence and response to flood light on dark moments of despair and misery.