As the Rabbi of Kotzk, in his blunt fashion, put it:
"The feast of Shavuot celebrates the day of the giving of the Torah, because on that day the Torah was given to Israel. But every person of Israel receives the Torah in his own way and in his own time."
The receiving of the Torah, however, is not just a capacity to grasp a certain body of knowledge; it is an act of breaking the limits of time and of contacting the infinite.
–Rabbi Adin Steinsaltz
From The Strife of the Spirit, p. 88, by Rabbi Adin Steinsaltz