How to find your inner light?

Exactly, as in everything that grows, there is a tiny germ of life, which is Divine, which makes even the little seed planted in the dark ground struggle to gather to itself exactly the particles needed for its growth—which makes the seed keep on growing and growing until it is firmly rooted and able to put up its shoots above ground, so, in every human heart, there is this divine knowledge that the God of Love has impregnated the soil of its life—or let us say, the surrounding circumstances of its life, with exactly the conditions, which will make it strong. Then it finds that every struggle helps it to take root more deeply, and finally, through this rooting and the discriminating following of the Divine instinct, at last it will put up a spiritual shoot into the sunshine.

Then it will find the corroboration of all its inner convictions. 

It will find that while underground it may have dreamed that the sun shone and the rain fell and the wind blew, and that flowers did blossom and grow, but now, after its long struggle, it has at last proved that all this is true.

Therefore, one of the most convincing, yet mystical sayings, is that the soul must grow, as the flower grows, silently, yet surely opening its heart to the spiritual Sun.

But at first, the Sun must be but the reflection of the Divine Immortal Spiritual Light, which lighteth everyone that cometh into the world, which shines deep within its own heart. 

Only as the soul thus follows this Light and keeps on struggling will the proof ultimately come to it that indeed it is all true.

The things we are personally inclined to are the things we cannot help believing, but commonsense says that we must put them to the proof.

Things in the outer life we are inclined to believe may or may not be true, but the inner mysteries of the soul to which we feel ourselves inclined we may depend upon. For they come from this Inner Light, which is given us to lead us into that which is especially needed for our soul's growth.

Letters from the Teacher, Volume II