Romans 14:15-16 — But if thy brother be grieved with thy meat, now walkest thou not charitably. Destroy not him with thy meat, for whom Christ died.
Let not then your good be evil spoken of.
destroy — present spiritual life ruined — deprive of ability to do God's will
The sacrifice of Christ in dying is contrasted with selfishness of doing something that will hurt a weaker brother.
good — liberty
The Greek word here translated destroy, cause the ruin, or, as I have rendered it, cause the loss, was used by our Lord to convey the idea of loss of reward. Whoever gives to one of these little ones even a cup of cold water because he is a disciple, truly, I say to you, he shall not lose his reward (Matthew 10:42). This Greek word was also used by John in his second epistle, where we read, Look to yourselves, that you may not lose what you have worked for, but may win a full reward (2 John 8).
The true believer, then, should enjoy complete liberty in Christ without digressing to the side path of libertinage. He is not answerable to the pastor, the session, or the other members of the congregation. He is answerable to God along. — Donald Grey Barnhouse, God's Glory, page 9.