Salt and light: we are to be them, for there are the instigators of change. They are what brings out the true self. They bring not one, generalized group, but many more diversity than ever seen before.
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When we compare ourselves to another person, it is a small, dim spectrum by which to measure ourselves. It is like comparing a robin's egg to a dove's egg; they both appear different, but for the most part, they are still just eggs.
When we compare ourselves to Christ, we see an impossibly huge distinction and a spectrum so wide that it is impossible to calculate. From the robin's egg to the robin itself; they look nothing alike.
Anyone who has been in the dark recognizes that the range of colors drops, depending on how dark it is. Everything appears dimmer, and details begin to fade. We see only dim resemblances of who people are. But when we step into the light, the details become clearer, more defined, more vibrant. If we were to live our entire lives in this sort of dark, would we think something like light would be possible?
Think also about salt. By itself, it is a strong, bitter taste, and we would think anything salted would taste just like this. But salt, rather than cloaking flavor like a blanket, brings the flavor out... kind of like light. The two images work well together to give us a glimpse of the kind of change God wants to do in us.
Back to the bird illustration, we were never meant to stay in the egg. We would then only die in darkness. We were meant to break out of the egg, piece by piece, strengthening our wings in the process. We become what we never thought possible, resembling more and more this robin that we hope to become.
If there is only one motivator for breaking out of the egg (because breaking out is hard, sounds painful, and from our perspective, can seem pretty pointless), let it be for this: so that the world can see a glimpse of Christ through us, and possibly desire such for their own lives. This is what evangelism is: allowing ourselves to be changed, so that the world may see, and change for the better right along with us.

