Creation is the language of God, Time is His song, and things of space the consonants in the song. To sanctify time is to sing the vowels in unison with Him.
This is the task of men: to conquer space and sanctify time.—The Sabbath, p. 101
Well, that's all for this book; it's just a short little thing. But as with all things by Heschel, well worth your time. I hope this encourages you to find a copy and read it!