佛遺教經論疏節要 1.95

1.95

若不攝守五根，非獨起欲妨道，將沈苦海而無涯畔。既失戒念，對治甚難，不可制也。故須防萌杜漸，勿令動心。

If one does not guard and restrain the five sense faculties, not only will desire arise to obstruct the Path, but one will also sink into the sea of suffering without bounds. Having lost precepts and mindfulness, applying the antidote is extremely difficult, and they cannot be restrained. Therefore, one must nip them in the bud and not let the mind be stirred.