It might surprise you, but the expression "pushing the envelope" has nothing to do with an envelope that contains a letter.
On the other hand, "pushing the envelope" is a military phrase used when a particular aircraft or system has gone beyond the boundaries of which it can operate safely and efficiently. We say we are "pushing the envelope" when we have gone beyond the normal limitations of doing something.
Top executives, government officials and church leaders "push the envelope" too often. From time to time the average person works to the breaking point while "pushing the envelope."
To "push the envelope" is to attempt to extend the current limits of performance. The expression also means to innovate, or go beyond commonly accepted boundaries.
The origin of the expression is about the mathematical envelope having to do with the intersection of the curve of an arc.You play it safe by staying outside the curve.The point here is that an envelope is that which envelops.
As the phrase is commonly used, it is to move beyond the limit of what has usually been done or to go to the limit of one's ability.
Some things are worth going to the extreme over; while other things should not go beyond its normal course.
Evaluate whether you are pushing the envelope, or if the envelope is pushing you.