«لِفَرْطِ اللَّهَجِ بِاقْتِبَاسِهِ وَالطَّمَعِ فِي تَقَمُّصِ لِبَاسِهِ»
Because of my intense desire to draw from it and to put on its garment.
Iqtibās here means borrowing or drawing benefit from learning; taqammus refers to donning a garment. The garment is a metaphor for internalizing literary skills and qualities.
The narrator does not simply want quotations to repeat. He seeks to make eloquence part of how he thinks and speaks.