Looking on the internet deeply has found these results:

It has been man's imperative is the most popular phrase on the web.

It is man's imperative 11 results on the web	It has been man's imperative 13 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
... those of conscience, which are rights only because it is man's imperative duty to obey its dictates. Our boasted 'inalienable rights of life, liberty, and the pursuit�...	Always, it has been man's imperative to understand how to submit to this Law; and, now it is plain that a Covenant as old as Abraham has been fulfilled through �... Always, it has been man's imperative to understand how to submit to this Law; and, now it is plain that a Covenant as old as Abraham has been fulfilled through �... Always, it has been man's imperative to understand how to submit to this Law; and, now it is plain that a Covenant as old as Abraham has been fulfilled through �...

It is man's imperative

11 results on the web

It has been man's imperative

13 results on the web

More popular!

... those of conscience, which are rights only because it is man's imperative duty to obey its dictates. Our boasted 'inalienable rights of life, liberty, and the pursuit�...

Always, it has been man's imperative to understand how to submit to this Law; and, now it is plain that a Covenant as old as Abraham has been fulfilled through �...
Always, it has been man's imperative to understand how to submit to this Law; and, now it is plain that a Covenant as old as Abraham has been fulfilled through �...
Always, it has been man's imperative to understand how to submit to this Law; and, now it is plain that a Covenant as old as Abraham has been fulfilled through �...