It depends on which creature you're intending to summon, and if you have a specific purpose for summoning that creature. Summoning 'spells' are probably intended as rituals, since casting a spell will often not do the trick.
If you need to summon one, you must have a important need. You cannot simply summon one to make you better at Magick. Summonings only take place when the Magick being performed requires a creature to be summoned.
In some cases, a mere magician, although highly advanced, cannot do Magick otherwise extremely advanced and powerful. A creature may be summoned to aid the magician. Creatures summoned to simply to make a person better at Magick may even anger the creature and rebounds will take place.
Re: best to summon
By: SunYote / Novice Dec 07, 2014
Post # 9
Perhaps, though you may need to develop a relationship with it, make it some sort of offering/sacrifice, or have proper powers to control it (often in the form of talismans and holy names). But what is it you want it to help you with?