Berean Study Bible
because a great door for effective work has opened to me, even though many oppose me.

King James Bible
For a great door and effectual is opened unto me, and there are many adversaries.

American Standard Version
for a great door and effectual is opened unto me, and there are many adversaries.

Darby Bible Translation
For a great door is opened to me and an effectual [one], and [the] adversaries many.

Douay-Rheims Bible
For a great door and evident is opened unto me: and many adversaries.

English Revised Version
for a great door and effectual is opened unto me, and there are many adversaries.

Young's Literal Translation
for a door to me hath been opened -- great and effectual -- and withstanders are many.