Read "loveliest of trees, the cherry now" by a. e. housman:

which excerpt from the poem best conveys the theme that we should make the most of every day because our lives go by so quickly

a. loveliest of trees, the cherry now / is hung with bloom along the bough

b. and stands about the woodland ride /wearing white for eastertide

c. about the woodlands i will go / to see the cherry hung with snow

d. now, of my three score years and ten / twenty will not come again