The Time for Us is Now

I'm working on a poem called "The Time for Us is Now". The latest version is posted here:

http://www.poems-and-quotes.com/misc/poems.php?id=1157754

I'd like to know what readers think of the poem. I also have several concerns I'd like to discuss with poets:

1) On line 8, I am undecided between "No obstacles obstruct our path" and "No obstacle obstructs our path"... Or I could ditch that sentence completely -- it is not a good one.

2) On line 11, I need a six syllable sentence that rhymes with "work". My best effort so far is "We tirelessly exert." which isn't six syllables and doesn't rhyme. I'm still working on that.

3) The stanzas are meant to follow a progression. The first says "We are vibrant"; the second says "We are capable"; the third says "We are dedicated"; and the fourth says "We will achieve". However, the fourth stanza is also meant to hint at a sense of obligation. By the end of the fourth stanza, I want the reader to group himself/herself among the "happy, vital spirits" and to realize that future generations are depending on him/her to take steps toward a better world.

4) The poem originally had five stanzas. I removed the second one because it didn't help the progression and because it made the poem too long.

We are inheritors of the earth, her children for a time.
We drink the sun and swim the sea and run and jump and climb.
Joy and awe and clarity, delight and love and reverence;
The world has shared its wonders and we revel in its abundance.

-TC