God decrees one state of affairs while also willing and teaching that a different state of affairs should come to pass. This distinction in the way God wills has been expressed in various ways throughout the centuries... For example, theologians have spoken of sovereign will and moral will, efficient will and permissive will, secret will and revealed will, will of decree and will of command, decretive will and preceptive will, voluntas signi (will of sign) and voluntas beneplaciti (will of good pleasure), etc.
John Piper