" Faith in the widest sense of the word, is assent to the truth, or the persuasion of the mind that a thing is true. In ordinary popular language we are said to believe whatever we regard as true. The primary element of faith is trust. The Hebrew word אָמַן means to sustain, to uphold. In the Niphal, to be firm, and, in a moral sense, to be trustworthy. In the Hiphil, to regard as firm, or trustworthy, to place trust or confidence in. In like manner the Greek πιστεύω (from πίστις, and that from πείθω, to persuade), means to trust, i.e., to be persuaded that a person or thing is trustworthy. Hence the epithet πιστός is applied to any one who is, and who shows himself to be, worthy of trust. "

― Charles Hodge , Systematic Theology Volume 3