Every time we look with increased resolution, Mars has said, 'Here's something you didn't expect. You don't understand me yet.' We're sure to find surprises.
Every time we look closer, we see surprising new things.
Every time we have increased our ability to resolve detail on the planet, we see new things, and we expect new surprises.
If we find evidence that (those) minerals are there, there must have been a time in Mars' early history when there was standing water on Mars' surface.