The real purpose of levying jiziya on them is to humiliate them to such an extent that they may not be able to dress well and to live in grandeur. They should constantly remain terrified and trembling. It is intended to hold them under contempt and to uphold the honour and might of Islam.
Source, in full
in S.A.A. Rizvi, Muslim Revivalist Movements in Northern India in the Sixteenth and Seventeenth Centuries, Agra, 1965, pp. 248-249. Quoted from Goel, Sita Ram (1995). Muslim separatism: Causes and consequences. ISBN 9788185990262