Kauśikaprajñāpāramitāsutra has several Prajñaparamita mantras like: oṃ hrī śrī dhī śruti smṛti mati gati vijaye svāhā [ninety two] A mala, or string of 108 beads, can help you manage a gradual respiratory rhythm for the duration of meditation. You can even use a mala to center on your mantra by https://baglamukhi70898.blogtov.com/7016092/getting-my-mantra-to-work