The doctrines of grace have helped me most because it shows the Transcendant Triune work of redemption.  It works as a well trained doctor.  It diagnoses the problem (humanity as fallen from our original state), and provides the cure, the remedy, the vaccination which gives life to what is dead.  It is not offering a cure for a sickness but rather life in place of an already existing death. And this is something outside of ourselves, namely God the Father, God the Son, God the Holy Spirit.  It shows the power and supremacy, love, and grace that is all contained in God which gives us a hope that is not to be shaken because it rests in the promises of our eternal Father.

This helps me in my life, my battle with sin, and also in my ministry to the lost, that I can give them the all powerful God who accomplishes and applies his will.

I do but not as consistantly as I should.  Many times I allow my studies to interfere and solely become Academic.  Right now I am reading through Paul's second letter to the Corinthian church

I hate answering this, just ask questions and you will find out