Abu Yazid Bistami was a deeply mystical Persian Sufi of the 9th c. CE who had great influence on the Sufis of his time. For a little more about him, see this post. He is reported to have said these thoughts.

Better than a virtuous act is the company of the virtuous, and worse than an evil act done is the company of the evil.

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Depend not on your effort, but on His grace.

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Consider the length of your life as TODAY and no more.