Hi, Why dovecot prints these messages when start up? And how to suppress it?

# /home/mail/init/dovecot.init restart Stopping Dovecot: [ OK ]
ILoading modules from directory: /home/mail/lib/dovecot/imap
IModule loaded: /home/mail/lib/dovecot/imap/lib01_acl_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib02_imap_acl_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib10_quota_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib11_imap_quota_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib20_autocreate_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib20_convert_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib20_expire_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib20_fts_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib20_mail_log_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib20_virtual_plugin.so
IModule loaded: /home/mail/lib/dovecot/imap/lib21_fts_squat_plugin.so
IEffective uid=99, gid=99, home=/tmp
IQuota root: name=user backend=dict args=:proxy::quota_dict Startting Dovecot: [ OK ]

Thanks :)

-- Xueron Nee http://www.xueron.com