Skandapurana 5.123.78

5.123.78

mantre tīrthe dvije deve daivajñe bheṣaje gurau ..
yādṛśī bhāvanā yasya siddhirbhavati tādṛśī .. .. 78 ..

Toward a mantra, a sacred ford, a twice-born, a deity, an astrologer, medicine, and a guru— / whatever kind of mental disposition one has, such perfection comes to be.