建议翻译成：“时刻保持清洁的心，你就能克服痛苦和疲倦，并接受你的弱点。”

参考诗篇51：10：神阿，求你为我造清洁的心，使我里面重新有正直的灵。（正直或作坚定）。

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Note added at 17 hrs (2015-06-17 01:30:12 GMT)
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在这里“清洁”是指在心灵上拒绝污染和污秽，包括酗酒，吸毒和其他不良嗜好。
参考 “撒 罗 尼 迦 前 书4：3 神的旨意就是要你们成为圣洁，远避淫行”。

关于sober,"covers far more territory than just abstaining from intoxicating beverages. The Greek word means: "to be calm and collected in spirit, to be temperate, dispassionate, circumspect," ...The basic idea is MENTAL CONTROL."
"Here is a good way to look at this: THERE ARE A LOT THINGS WHICH INTOXICATE THE MIND, AND INTERFER WITH GOOD JUDGMENT: Excessive worry...continued anger...jealousy...resentment... and also things like alcohol and drug abuse. To be SOBER - in the full meaning of the word - WE MUST AVOID THOSE THINGS THAT WOULD DISTORT OUR THINKING AND JUDGMENT. The idea is a calm, collected, controlled mental state."

“...stayed clean for 30 days!" 指的是”保持清洁，远避污行30天”，所以要特别祝贺。
希望以上解释能有所帮助。