# be obedient to

"obey." This is a command. Paul does not write in this chapter about whether slavery is good or bad. Paul teaches about working to please God whether as a slave or as a master. What Paul teaches here about slavery would have been surprising. In his time, masters were not expected to treat their slaves with respect and not threaten them.

# your masters according to the flesh

"your human masters" 

# deep respect and trembling

The phrase "deep respect and trembling" uses two similar ideas to emphasize the importance of slaves honoring their masters. 

# and trembling

"and fear"  

# in the honesty of your heart

"with sincerity"