Faith is knowing that God is real and that you can trust in God’s promises. You cannot trust someone who isn’t there, nor can you rely on someone whose promises are not reliable. This is why faith is talked about as the substance of things hoped for and as the evidence of things not seen. Both words carry with them a sense of reality. Our hope is not wishful thinking. The Christian is called to see things as they really are, and not as she would simply like them to be. Faith does not make God real. On the contrary, faith is the response to a real God who wants to be known to us.
“Faith is the substance of things hoped for, the evidence of things not seen,”
Taken from A Slice of Infinity’s What is Faith? by Michael Ramsden