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Using RSA encryption, should I use the same certificate to sign and encrypt a message?

If I want to sign and encrypt a message using an X509 certificate, is there any reason not to use the same certificate for encryption and signing?

Update: Looking back, I think this should be the most wavy question I have ever asked. Sorry.

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The X509 certificate contains a public key. For encryption, you use the recipient’s public key, supposedly obtained from your certificate. To subscribe, you use your private key, presumably from a secure vault. The recipient verifies the signature using your public key, presumably from your certificate. These are the basics.

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The sender uses his private key to sign the message. The message is encrypted with the recipient's public key. The certificate contains a public key. Presumably, the sender’s public key (corresponding to the sender’s private key used to sign the message) is also presented in the certificate.

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