Yes, you can print famous quotations on T-shirts. This can be a great way to express your personal style, show support for a cause, or simply share your favorite quotes with others. However, it's important to be mindful of copyright and trademark laws. If the quotation is protected by copyright or trademark, you may need to obtain permission from the rights holder before using it for commercial purposes.
If the quote is in the public domain, you are free to use it without permission. Additionally, under fair use, there may be certain circumstances where you can print quotations on T-shirts without permission, but it's advisable to consult legal advice to learn about the specifics of fair use in your situation.