A "little thing" is a small object or a minor detail or issue. It can also mean a small act or moment that quietly affects feelings or outcomes. People use it to downplay importance or to speak fondly about someone small.
God is love, man is (as one says to a child) a silly little thing, even so far as his own wellbeing is concerned. Source: Internet
But don't let a little thing like reason interrupt your circle jerk. Source: Internet
I owe the NHS my life, so I just wanted to do this little thing for them, and I thought, if it gets into the Top 40, I'm happy.” Source: Internet
“Every little thing helps when you’re a small business.” Source: Internet
Frankly I'm tired of hearing about how every little thing is dangerous and why I'm a bad person if I do it. Source: Internet
It’s absolutely impossible for you to know exactly what’s going on in someone else’s head, the ideals and baggage that have built their world view, and every other little thing that’s going on in their life and adding to their stress level. Source: Internet