These are some Latin phrases that can be used in incantations or in scripture for your Grimoire/Book of Shadows. Of course there are many more languages that can be used, but I am definitely drawn more to older languages.
ab intra - from within
ab origine - from the source
absit iniuria - “let insult be absent”
absit invidia - “let envy be absent”
absit omen - “let omens be absent”
ab uno disce omnes - from one, learn all.
abyssus abyssum invocat - deep calleth unto deep
a capite ad calcem - from head to heel
acta non verba - actions not words
ad altiora tendo - “I strive to higher things”
ad astra - to the stars
ad fontes - to the sources
ad meliora - towards better things
ad oculos - to the eyes
ad undas - to the waves
ad victoriam - to victory
adsum - I am here
a fortiori - from the stronger/from strength
a mari usque ad mare - from sea to sea
audeamus - let us dare
audentes fortuna iuvat - fortune favors the bold
audi, vide, tace - hear, see, be silent
beatae memoriae - of blessed memory
bona fide - in good faith
bono malum superate - overcome evil with good
capax infiniti - holding the infinite
carpe diem - seize the day
carpe noctem - seize the night
cave - beware
ceteris paribus - all other things being equal
circa - around
citius, altius, fortius - faster, higher, stronger
clavis aurea - golden key
cogito ergo sum - I think, therefor I am
compos mentis - in control of the mind
concilio et labore - by wisdom and effort
concordia cum veritate - in harmony with truth
concordia salus - well-being through harmony
coniunctis viribus - with connected strength
consummatum est - it is complete
corruptus in extremis - corrupt to the extreme
crescit eundo - it grows as it goes
de novo - from the new
de profundis - from the depths
dies irae - day of wrath
dona nobis pacem - give us peace
ego te provoco - I challenge you
esse est percipi - to be is to be perceived
esse quam videri - to be, rather than to seem
esto quod es - be what you are
ex animo - from the soul
ex luna scientia - from the moon, knowledge
ex scientia tridens - from knowledge, sea power
ex silentio - from silence
ex undis - from the waves of the sea
experientia docet - experience teaches
fac et spera - do and hope
fac fortia et patere - do brave deed and endure
faciam quodlibet quod necesse est - I’ll do whatever it takes
faciam ut mei memineris - I’ll make you remember me
facta, non verba - deeds, not words
fortis et liber - strong and free
fortis in arduis - strong in difficulties
gloriosus et liber - glorious and free
hic abundant leones - here lions abound
hic et nunc - here and now
hic sunt dracones - here there are dragons
hinc illae lacrimae - hence those tears
hinc itur ad astra - from here the way leads to the stars
igni ferroque - with fire and iron
in memoriam - into the memory
in nocte consilium - advice comes over night
libra - balance
littera scripta manet - the written words endure
locus standi - a right to stand
luceo non uro - I shine, not burn
luctor et emergo - I struggle and emerge
mare liberum - free sea
memento vivere - remember to live
more ferarum - like beasts
natura non contristatur - nature is not saddened
nec spe, nec metu - without hope, without fear
noli me tangere - do not touch me
ophidia in herba - a snake in the grass
pro se - for oneself
propria manu - by one’s own hand
quaere - to seek
quod abundat non obstat - what is abundant does not hinder
resurgam - I shall arise
semper ad meliora - always towards better things
semper anticus - always forward
semper apertus - always open
semper fortis - always brave
semper liber - always free
stet - let it stand
tuebor - I will protect
vera causa - true cause