1 Corinthians 9

Paul counseled concerning ministering -

"To the weak became I as weak, that I might gain the weak: I am made all things to all men, that I might by all means save some."  (1 Corinthians 9:22)

But still counseling -

"To them that are without law, as without law, (being not without law to God, but under the law to Christ,) that I might gain them that are without law."  (1 Corinthians 9:21)

Suggesting to me that "but under the law of Christ", he still maintained his gospel standards.