I know this is probably all over the shop but.......
Is there a way of shortening it to say something like,
'Smaonaigh ar inné, ullmhaigh don amárach, ach i gcónaí mair inniu.'
What I am trying to say is:
Think of yesterday, prepare for tomorrow but always live today.
Wait for the grammar vultures to tear it apart! I'm almost afraid to look; I can feel them swooping already!

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Is foghlaimeoir mé. I am a learner. DEFINITELY wait for others to confirm and/or improve.
Beatha teanga í a labhairt.