Luke 10:25-28 (‘You shall love the Lord your God...and your neighbour as yourself’) uses the term ‘agape’ (self-sacrificial love) and is followed by the parable of the Good Samaritan in which ‘neighbour’ is interpreted broadly.
Ephesians 4:25-27 (‘..putting away falsehood, let all of us speak the truth to our neighbours’) shows that Christians value truth-telling; the writer of this passage may have been thinking of Zechariah 8:16.
II Corinthians 1:12 (‘...we have behaved in the world with frankness and godly sincerity’) teaches that the way to have a good conscience is to not act in ways that are not true to oneself.
I Timothy 1:5 (‘love that comes from a pure heart, a good conscience, and sincere faith’) comes from a passage in which the writer is concerned with the ‘sophisticated’ discussions of some teachers.
Matthew 6: 14-15 (‘...if you forgive others their trespasses, your heavenly Father will also forgive you’) follows the Lord’s prayer and makes the case that we access God’s forgiveness by embodying that quality ourselves.
Colossians 3:12-13 (‘...just as the Lord has forgiven you, so you also must forgive...’) teaches that what Jesus has done on the cross, Christians must also do in their relationships with others.