Ubhayasutta 2.1

2.1

Tatra, bhikkhave, yāyaṃ paṭipadā dukkhā dandhābhiññā, ayaṃ, bhikkhave, paṭipadā ubhayeneva hīnā akkhāyati. Yampāyaṃ paṭipadā dukkhā, imināpāyaṃ hīnā akkhāyati; yampāyaṃ paṭipadā dandhā, imināpāyaṃ hīnā akkhāyati.

Of these, the painful practice with slow insight is said to be inferior in both ways: because it’s painful and because it’s slow.