light of.

Luke 11:34-36
Your eye is the lamp of your body. When your vision is clear, your whole body also is full of light. But when it is poor, your body is full of darkness. . . .

single.

Acts 2:46
With one accord they continued to meet daily in the temple courts and to break bread from house to house, sharing their meals with gladness and sincerity of heart,

2 Corinthians 11:3
I am afraid, however, that just as Eve was deceived by the serpent's cunning, your minds may be led astray from your simple and pure devotion to Christ.

Ephesians 6:5
Slaves, obey your earthly masters with respect and fear and sincerity of heart, just as you would show to Christ.

Colossians 3:22
Slaves, obey your earthly masters in everything, not only to please them while they are watching, but with sincerity of heart and fear of the Lord.