Evangelistic

Regulatory bodies, like the people who comprise them, have a marked life cycle. In youth they are vigorous, aggressive, evangelistic, and even intolerant. Later they mellow, and in old age—after a matter of ten or fifteen years—they become, with some exceptions, either an arm of the industry they are regulating or senile.

His time had been occupied to the utmost; and marvellous had been the results of his evangelistic labours.

I was pretty evangelistic about the merits of working in a small team.