Trust

The Divine Grace is always with you and by your trust you allow its action to be effective. Have an absolute trust in the Grace, set aside your little personality and allow the Grace to act; it will make you do what is needed and everything will be all right.

Faith

Faith is a certitude which is not necessarily based on experience and knowledge.
Faith―confidence in the Divine and the unshakable certitude of the Divine’s Victory.
Faith is the soul’s witness to something not yet manifested, achieved or realised, but which yet the Knower within us, even in the absence of all indications, feels to be true or supremely worth following or achieving. This thing within us can last even when there is no fixed belief in the mind, even when the vital struggles and revolts and refuses…

Certitude

One must find one’s certitude within oneself, keep it in spite of everything and go one’s way whatever the cost, to the very end. The Victory is for the most enduring.
Faith is a certitude in the soul which does not depend on reasoning, on this or that mental idea, on circumstances, on this or that passing condition of the mind or the vital or the body.