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No way to operate that amp in the real gig world and be certain that they never exceed 25 watts output. Not by ear. If you go with a speaker rated for less power than the amp puts out, put a fast-blow fuse in line with it so you can blow a cheap fuse instead of an expensive speaker. A 1.5 amp fuse would be about right if your amp is designed for an 8 ohm output and you are running an 8 ohm speaker. Buy a box of fuses, you will need them as you learn what amp settings you can use with your instruments.
If we are talking about a speaker you are considering buying, my advice is don't even consider buying a speaker with less than a 50 watt rating for your 40 watt amp. Who needs the hassles?
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