What is the difference between spirituality and philosophy?

A wise man has said:

Religion without philosophy is fanaticism, and philosophy without religion is mental speculation.

If we translate spirituality into religion, real religion is backed by an explanatory philosophy. So spirituality and philosophy go hand in hand. Philosophy describes existential facts of living in the world, and spirituality means living life according to that philosophy.

In the modern world, religion has been reduced to mere faith, but Spirituality or religion is not just a matter of faith. Religion must be based on empiric facts, not just belief. If religion cannot help us understand how nature works, and how we are meant to interact with nature, then what’s the use of that religion?

"Religion and science are opposed ... but only in the same sense as that in which my thumb and forefinger are opposed - and between the two, one can grasp everything." - Sir William Bragg, Nobel Prize in Physics 1915

All living entities are spiritual in essence, for the soul in all living entities is a minute, spiritual spark of consciousness. Most living beings are not aware of their spiritual essence. In the lower species, for instance, there is no awareness of the soul. In the animal species there is total absorption of the consciousness in eating, sleeping, mating, and defending.

The human life-form is a very rare and unique opportunity for the soul to become aware of itself. But very few humans have any interest in becoming spiritually aware. Like in the lower species, they have elected to absorb themselves in their bodily identity, and the culture they happen to appear in.

Modern mankind is totally absorbed in eating, sleeping, mating and defending. Certainly, they may be more refined than animals. But a culture that revolves around gratifying a material body and mind, is basically an animal culture.

Even if humans are more refined in their material activities than animals - they may eat their food bought from a supermarket nicely wrapped in plastic, from porcelain plates with a knife and a fork, they may sleep or mate on box-spring mattresses, and defend themselves with missiles and high-tech bombs, but if they are not aware of themselves as souls, spiritually, they are no more advanced than animals that eat their food raw from some prey, sleep on the ground, and defend themselves with tooth and claw.

Without spiritual awareness a human being is no better than an animal.

It is spiritual understanding that makes a human a human, not the advancement of technology, or even the ability to read and write. What do they read and write about? What are all the great literature about? What’s on CNN and Fox news? It can all be boiled down to - eating, sleeping, mating, and defending.

“Both animals and men share the activities of eating, sleeping, mating and defending. But the special property of the humans is that they are able to engage in spiritual life. Therefore without spiritual life, humans are on the level of animals.” —Hitopadesa

The union of spirituality and philosophy is best described by God in Bhagavad Gita.

Krishna says:

Humility, pridelessness, nonviolence, tolerance, simplicity, approaching a bona fide spiritual master, cleanliness, steadiness and self-control; renunciation of the objects of sense gratification, absence of false ego, the perception of the evil of birth, death, old age and disease; nonattachment to children, wife, home and the rest, and evenmindedness amid pleasant and unpleasant events; constant and unalloyed devotion to Me, resorting to solitary places, detachment from the general mass of people; accepting the importance of self-realization, and philosophical search for the Absolute Truth -- all these I thus declare to be knowledge, and what is contrary to these is ignorance. —Bg 13.8-12

And I declare that he who studies this sacred conversation of ours worships Me by his intelligence. —Bg 18.70