Siman 506

(63.) Once I spoke with him about the many thoughts that confuse me — the melancholy and anxieties in the performance of mitzvos — such as in washing hands, about which I had anxieties that confused me greatly. And he replied: "I have already spoken with you that you do not need to look into this etc." And I spoke with him further about many such matters — and I said to him: "Also this itself confuses me etc." He replied: "Do not begin to think at all." And this is a wondrous counsel for every matter — for many times thoughts greatly confuse. And whatever...