Credo elvem etiam vivere - I believe Elvis lives
Credo nos in fluctu eodem esse - I think we're on the same wavelength
Credo quia absurdum - I believe it because it is absurd. (contrary to reason) (Tertullian)

Credo ut intelligam

I believe in order that I may understand. (St. Augustine)

Credula vitam spes fovet et melius cras fore semper dicit - Credulous hope supports our life, and always says that tomorrow will be better. (Tibullus)
Crescit amor nummi, quantum ipsa pecunia crevit - The love of wealth grows as the wealth itself grew. (Juvenalis)
Crescite et multiplicamini - Increase and multiply
Crimen falsi - Perjury
Crudelius est quam mori semper timere mortem - It is more cruel to always fear death than to die. (Seneca)
Crux - Puzzle