For your post to be heresy, there must be dogma which you are rejecting.

I don't know what dogma that would be since I don't subscribe to any dogma which you are threatening.

In fact quite the reverse. I would encourage you to learn other languages. You are bound to learn things which will help you. For instance learning Ruby taught me lessons about design that have helped my Perl.

You may learn that Perl is not the right language for you. In which case it is better to learn that now than it is to wait several more years and develop some bitterness towards Perl. You may learn that in retrospect Perl wasn't so bad for you after all, which is a lesson that you can't learn from just learning a bunch more Perl. Either way it is better for you and for Perl for you to learn those lessons sooner rather than later.