SB 11.23.45
danam sva-dharmo niyamo yamas ca
srutam ca karmani ca sad-vratani
sarve mano-nigraha-laksanantah
paro hi yogo manasah samadhih
Translation:
Charity, prescribed duties, observance of major and minor regulative principles, hearing from scripture, pious works and purifying vows all have as their final aim the subduing of the mind. Indeed, concentration of the mind on the Supreme is the highest yoga.