Isn’t the contemplative side of Catholic mysticism have an almost eastern philosophy?
Not Eastern as in Far East.
But Eastern Christian Orthodox influences, absolutely.
The hermits of Mt Carmel and the Desert Fathers of Egypt, were given the gift of contemplation which they taught to their disciples, which spread to the West.
However, during the dark ages and especially during the Inquisition, teachings on contemplation were confined to convents and monasteries.
During the time of St Teresa of Avila, in the 1500’s Spain, books on such spirituality were banned and destroyed.
It was only through the Holy Spirit that Teresa of Avila and St John of the Cross were able to revise teaching on contemplation, but even there, it remain pretty much in the convents and monasteries.
Eventually lay people seeking a deeper level of prayer were drawn to the spirituality of the contemplative orders and 3rd orders were formed from them.
Since Vatican II, lay people have had access to the writings of the Spiritual Masters of the Catholic Church which were before kept obscure.
Jim