Is it ok to cast spells once without protection circle?

Merry Meet Seeker,
Protection circles are created so that the beneficial energy from the current environment as well as the energy raised by our spirit comes together to support our goal. Although protection circles are not necessary at all times, it is best to use it unless we are absolutely sure that there are no entities with high negative energy running around to mess up our spell.
Some people believe that the space below our land contains a lot of negative energy. Since the circle we create is partially above the land and partially below the land, we are not sure of the type of residual energy under the ground we live on. Also, depending on the day of the month or time of the day, the energies keep shifting. For example, many people believe that twilight time is not conducive to spell working as the day turns into night and the astral beings may be on the prowl path.
Since we have entities all around us that most of us cannot see or feel, it is best to create protection circles so that our spell will be contained in the spot we decide. It doesn’t take much time to create the circle. This way, the energy we raise will stay with us and enable us to create our goals easily and with much more power.
Trice around the circle’s bound
Sink all evil into the ground
Say it three times and end with, So Mote It Be
is just one of the ways in which you can protect your circle and enhance your spell activity.
As you continue to work on spells, this will become an easy and enjoyable activity.
Brightest Blessings
Rose.