Best way to prepare for Spiritual Life

The best way to prepare oneself for the spiritual life when one has to live in the ordinary occupations and surroundings is to cultivate an entire equality and detachment and the samatā of the Gita with the faith that the Divine is there and the Divine Will at work in all things even though at present under the conditions of a world of Ignorance. Beyond this are the Light and Ananda towards which life is working, but the best way for their advent and foundation in the individual being and nature is to grow in this spiritual equality. That would also solve your difficulty about things unpleasant and disagreeable. All unpleasantness should be faced with this spirit of samatā.

Ref : Letters on Yoga Vol. II