Something I've noticed is almost every speech, devar Torah, or words of inspiration I hear end the exact same. The speaker ends with some permutation of the following words:
May we all merit to see the coming of moshiach, speedily in our days, amen.
I have a very strong feeling this is a recent practice. I don't think in Europe people were ending their speeches this way.
What is the earliest recorded time that a speech ended this way, either in print or transcribed. Bonus points for a reasonable explanation for what triggered this change in practice.