it is not so essential to think much as to love much: therefore you must practice whatever most excites you to this. Perhaps we do not know what love is, nor does this greatly surprise me. Love does not consist in great sweetness of devotion, but in a fervent determination to strive to please God in all things, in avoiding, as far as possible, all that would offend Him, and in praying for the increase of the glory and honor of His Son and for the growth of the Catholic Church. These are the signs of love; do not imagine that it consists in never thinking of anything but God, and that if your thoughts wander a little all is lost.
St. Teresa of Jesus The Interior Castle Chapter 1