Spurgeon says that “almost all the definitions (of faith) I have met with have made me understand it less than I did before I saw them.” His own description, though, is helpful.
” Faith is not a blind thing; for faith begins with knowledge. It is not a speculative thing; for faith believes facts of which it is sure. It is not an unpractical, dreamy thing; for faith trusts, and stakes its destiny upon the truth of revelation. That is one way of describing what faith is.
Let me try again. Faith is believing that Christ is what He is said to be, and that He will do what He has promised to do, and then to expect this of Him.” Charles Spurgeon