from 4102; to have faith (in, upon, or with respect to, a person or thing), i.e. credit; by implication, to entrust (especially one's spiritual well-being to Christ):

KJV-- believe (-r), commit (to trust), put in trust with.

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4102 pistis (pis'-tis);

from 3982; persuasion, i.e. credence; moral conviction (of religious truth, or the truthfulness of God or a religious teacher), especially reliance upon Christ for salvation; abstractly, constancy in such profession; by extension, the system of religious (Gospel) truth itself:

KJV-- assurance, belief, believe, faith, fidelity.

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3982 peitho (pi'-tho);

a primary verb; to convince (by argument, true or false); by analogy, to pacify or conciliate (by other fair means); reflexively or passively, to assent (to evidence or authority), to rely (by inward certainty):

KJV-- agree, assure, believe, have confidence, be (wax) conflent, make friend, obey, persuade, trust, yield.