Q: If one has faith in the Divine and also trust, what is the difference between faith and trust?
Faith is something much more integral—that is what Sri Aurobindo has written—much more integral than trust. You see, you have trust in the Divine, in the sense that you are convinced that all that comes from Him will always be the best for you: whatever His decision and whatever the experience He sends you or the circumstances in which He puts you, it will all be always what is best for you. This is trust. But faith—that kind of unshakable certitude in the very existence of God—faith is something that seizes the whole being. It is not only mental, psychic or vital: it is the whole being, entirely, which has faith. Faith leads straight to experience.
Ref: Questions and Answers 1954