Faith, says Hebrews, ‘gives substance to our hopes and makes us certain of realities we do not see’.
We have not seen Jesus, unless we have had a vision. We have not seen Jesus but at some level, in some way we believe in him and trust in him and see him as our friend and saviour.
And we cannot see God the Father, yet we can envisage God as our Creator and the one who breathes life into us.
We cannot see the Spirit. All we can do is to believe in the power of the Spirit, have faith in that power, and live.