G5940 - Strong's Greek Lexicon Number


It is necessary.
See Definition for dei { [G1163]}
See Definition for opheilei { [G3784]}

dei, the third person of deo, is commonly used impersonally in
classical Greek. This usage is less common, but frequent, in the N.T.
dei indicates a necessity in the nature of things rather than a
personal obligation? it describes that which must be done.

opheilei indicates rather the personal obligation? it is that which
is proper, something that ought to be done.