Hashem's Prophecy to Balaam was introduced by ויקר (Vayikra without an Alph).While Hashem's Prophecy to Moshe was introduced by ויקרא (Vayikra with an Alph).There is a question which arises,  why is the word ויקרא spelled in the Torah with a small Alph ? The Baal Ha Turim explains that after the fact that Hashem instructed Moshe to write an Alph as an expression of affection, Moshe humbly wrote a small Alph. Furthermore Rabbi Buam of P'schishca explains that Alph means to teach, Thus implying that one should learn to always be small and humble like the small Alph.