I think sometimes about how a handful of stars in the night sky are a comfort, even if they don't illuminate your path. The thing is, you have to look up to see them. If all your energy is focused on your feet, on not-stumbling, you miss the solace and light that's given to you.
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I do believe feet are important, however. I mean, an awful lot is possible -- way more than we think -- when we concentrate on always taking the next step. Paralysis keeps you where you are, which usually makes matters worse. As Winston Churchill said, "When you're going through hell... keep going."
Sometimes our feet have more faith than our hearts. Sometimes, when hope is hard to come by, our feet keep us moving along the path of helping and serving and praying. They take us places and keep us doing the things we must do, even when we don't feel motivated or charitable or inspired.
People (myself included) make the mistake of thinking everything has to start from the heart. It's not so. Sometimes when we go ahead and do what needs to be done, eventually our heart catches on.