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द्वाराणि सम्यक्प्रवदन्ति सन्तो बहुप्रकाराणि दुराचराणि ।
In plain words
The good describe these gates exactly as they are: there are many of them, of many kinds, and every one of them is hard to walk through.
Close to the Sanskrit
The gates the good declare rightly — many in kind, hard to practise.