I am now completely convinced that you will recognize from these arguments that the more you strip yourself of the products of your imagination and all worldly and created things, and are united to God with your intellect by a good will, the closer you will approach the state of innocence and perfection. What could be better? And what could be more happy and joyful? Above all it is important for you to keep your mind bare—without imaginations and images and free of any sort of entanglement, so that you are not concerned about either the world, friends, prosperity or adversity, or anything present, past or future, whether in yourself or in others—not even your own sins. But consider yourself with a certain pure simplicity to be alone with God outside the world, and as if your mind were already in eternity and separated from the body so that it will certainly not bother about worldly things or be concerned about the state of the world, about peace or war, about good weather or rain, or about anything at all in this world, but with complete docility will turn to God alone, be empty for Him and cleave to Him. So now in this way ignore your body and all created things, present or future, and direct the high point of your mind and spirit directly, as best you can, naked and unencumbered on the uncreated light. And let your spirit be cleansed in this way from all imaginations, coverings and things obscuring its vision, like an angel (not) tied to a body, who is not hindered by the works of the flesh nor tangled in vain and wandering thoughts. Let your spirit therefore arm itself against all temptations, vexations, and injuries so that it can persevere steadily in God when attacked by either fame or fortune. so that when some inner disturbance or boredom or mental confusion come you will not be indignant or dejected because of it, nor run back to vocal prayers or other forms of consolation, but only to lift yourself up in your intellect by a good will to hold on to God with your mind whether the natural inclination of the body wills it or not.  –St Albert the Great ‘On Cleaving to God’.

St Albert the Great a Dominican teacher and defender of St Thomas Aquinas.