Will skipping a day in your workout make you "restart"?

So I've been working out everyday and my friend (who is also training me) said that if I skip a day I have to start over from the beginning with my muscles. I doubted his statement because I always thought "you need some days of rest for your muscles to grow", but then I remember seeing something on the internet saying "persistence is key. Don't give up!" And so I thought that my friend could be right? So is he right? Do I have to restart if I skip a day of working out? I skipped today because my allergies were going haywire.
Will skipping a day in your workout make you "restart"?
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