Colossians 1:25
according to <2596> [according.]
to complete <4137> [to fulfil. or, fully to preach.]
Colossians 1:28
<3739> [Whom.]
instructing <3560> [warning.]
teaching <1321> [teaching.]
all ... with all ........ every .... in <1722 3956> [in all.]
we may present <3936> [we may.]
mature <5046> [perfect.]
Colossians 2:1
how great <2245> [what.]
a struggle <73> [conflict. or, fear, or, care. at.]
not <3756> [not.]
Colossians 4:3
pray <4336> [praying.]
that <2443> [that.]
a door <2374> [a door.]
The term door is used metaphorically for an entrance to any business, or occasion or opportunity of doing any thing; and consequently "a door of utterance" is an opportunity of preaching the gospel successfully. See the parallel texts.
mystery <3466> [the mystery.]
for ...................... for <4012 1223> [for.]