As if

Free will may be an illusion; everything is determined by something else. But we must live as if we can make our own decisions and be responsible for our actions.

Maybe life has no particular meaning; it is just what it is. There may be no reason for suffering and pain. But meaninglessness can make you drown. We have to live as if life and suffering may have a meaning. This can help you keep your nose above the surface.

Maybe you don't have an eternal soul. Maybe God is just a fantasy figure. There may be no spiritual laws stipulating how we shall live. But you can live as if you have a soul, that there are spiritual laws that you must follow, and that there are angels that can help you. 

There is no meaning in life and suffering, no God, and no spiritual laws; the world is nothing but electrons, quarks, and indifferent forces. This is an absolutely useless philosophy. Modern natural science is harmful to mental health. Its "truths" are poisons. It deduces the meaning of life from what scientists can see in laboratories, observatories, and mathematical calculations. They live as if there is no meaning to life or spiritual laws. They are nihilists.

We don't care about up quarks and electron spin in our everyday lives or how big and old the universe is. Such "truths" are utterly irrelevant in our daily lives. Life is what is going on here on an everyday level. Free will, love, conscience, and spiritual laws are essential here. 

Of course, religious dogmas, doctrines, and New Age superstition are also poisonous. They also belong to the theoretical dimension of life. The theoretical dimension is not harmful per se, but if it takes over your life, you will find yourself in a cage. We are not living in a theoretical world.