Unless You Walk in My Shoes
It's difficult to relate to how someone feels about something when you haven't walked in their shoes. While we can empathize with them or pray for them, it's hard to really understand how some particular struggle in life affects them. If we haven't been through something similar to what another person is going through, our ability to really know how it affects them is limited.
With that in mind, we still need to be supportive and help those who are in need of our help, while at the same time not necessarily saying we know how they feel about something, when in fact, most of the time we don't.
That doesn't take away from being helpful, it helps to not make us look like we are attempting to know what is happening with someone, when we haven't been through what they have been through.