Cowardice
Cowardice — the failure of courage in the face of danger, opposition, or persecution — is treated in Scripture as a spiritual failure rather than a mere temperamental weakness. The Mosaic military law released from battle those who were "afraid and fainthearted," lest they discourage others (Deut. 20:8). The repeated divine exhortation "Fear not" and "Be strong and courageous" (Deut. 31:6; Josh. 1:9) implies that courage must be cultivated and cowardice resisted through trust in God's presence and promise.
The NT applies this spiritually: Paul urges Timothy, who seems prone to timidity, that "God gave us a spirit not of fear but of power and love and self-control" (2 Tim. 1:7). The disciple who publicly denies Christ — as Peter did — is a form of cowardice that Jesus warned against (Matt. 10:33). Revelation's solemn list of those excluded from the heavenly city begins with "the cowardly" (Rev. 21:8) — those who, fearing earthly consequences, denied Christ or abandoned faith under pressure. The antidote is faith in the sovereignty of God and love that casts out fear (1 John 4:18).