Everyone notices the strength of muscle, but what about the strength of the heart?

Why is it that everyone compares the strength of muscle, or how strong you can be, or how many pounds you can lift, but nobody ever notices the inner strength of somebody, and how much someone can go threw and still be able to have a smile on their face? I mean there's people out there, that cry themselves to sleep but smile and try to make everybody elses day good even if there's is going absolutely terrible.
Inner strength is absolutely amazing, someone could go through hell and back, and still be able to laugh, have a good time and keep that beautiful smile on their face. The strength of muscle, only lasts if you keep working out on it.. Inner strength is a trait you have that stays with you forever, as long as you don't keep pushing your feelings away. See, there's bad things to it to, you can't hide your feelings, you need to let it out sometimes, you can't bottle them up, it leads to depression.. Inner strength is amazing, but dangerous at the same time. Either way, some people are stronger then they think. 

Imperfection, is perfection
xo