Big things are awesome. You can hold them up and show the world your big thing and the world will look back at you with admiration and awe. You can say “look at this big thing I did!” and it will in some ways validate your existence for a bit. Small things are often perceived as mundane, small things often seem irrelevant, nobody sees the small things except you.
But without small things there are never big things.
If you want to build a house, which is big, you need bricks, which are small.
If you want to write a book, which is big, you need carefully selected words, which are small.
If you want to be a sporting champion, which is big, you need to consistently execute training sessions on a daily basis for years and years and years, which are small.
To the outside world big things matter more than small things. But if you are the person taking action, small things have to matter more than big things because without the small things there are no big things.
Small things are rooted in presence and presence is a good thing. Big things have a moment of presence and then they become trapped in either past experiences or future desires, which consistently pull you from the present moment, which is not a good thing.
Focus on small things and in time they will lead you to big things. Focus only on big things and in time you will be really great at daydreaming about big things.