This will prevent Sai from sending you messages, friend request or from viewing your profile. They will not be notified. Comments on discussion boards from them will be hidden by default.
“Though we are incomplete, God loves us completely. Though we are imperfect, He loves us perfectly. Though we may feel lost and without compass, God's love encompasses us completely. ... He loves every one of us, even those who are flawed, rejected, awkward, sorrowful, or broken.”
―
Dieter F. Uchtdorf