The Greek noun eilikrineia means sincerity, genuineness, and moral purity — that which is unmixed with base motive or deception. The word may derive from eilē (sunlight) and krinō (to judge) — what is tested in full sunlight and found pure. It describes integrity that has nothing to hide.
Paul uses eilikrineia in 1 Corinthians 5:8 and 2 Corinthians 1:12 and 2:17 to describe the authentic, unmixed motives that should characterize gospel ministry. The 'unleavened bread of sincerity and truth' contrasts with the corruption of malice and evil. In a world where religious performance often masks impure motives, eilikrineia — the transparent, sunlight-tested purity of genuine faith — marks the true servant of Christ.