Mahabharata 12.99.7

ब्रह्मचर्येण घोरेण आचार्यकुलसेवयावेदानधीत्य धर्मेण राजशास्त्रं च केवलम्

brahmacaryeṇa ghoreṇa ācāryakulasevayāvedānadhītya dharmeṇa rājaśāstraṃ ca kevalam

Our plain-language meaning of this verse is waiting for scholar review.