Worksheet change endless iterations

I am having trouble understanding the correct used of Worksheet_Change.
When used to target a specific cell, if that cell is altered, then the change is called again... and again and again.
I've simplified the code below to show what I mean.

Private Sub Worksheet_Change(ByVal Target As Range)
    Select Case Target.Address
        Case “$A$1”
            If (conditions) Then Range(“$A$1”) = new value
   End select
End sub

What is the best way of tackling this problem, avoiding an endless cycle of calling?