Theory only holds until practice proves that it is just plain wrong.

This practice proved highly useful to the language group.

The practice was proving of use on this occasion.

But the practice proved a great burden when the stock market began its slide.

His practice with the scythe, long ago in life, had proved well worthwhile!

There is no single right approach to teaching writing; however, some practices prove to be more effective than others.

Along with each step, certain practices proved especially important to the success of their efforts.

This practice of open access proved successful and rewarding.

At the time, this practice proved invaluable to Elvis' career.

Yet here too the practice of Thatcherism proved less abrasive as time went on.