Sinclair B. Ferguson said this quote

The knowledge of our union with Christ...gives us confidence in prayer. It was when Jesus had begun to expound the closeness of this union that he also began to introduce the disciples to the true heart of prayer. If Christ abides in us and we abide in him, as his word dwells in us, and we pray in his name, that God hears us (Jn 15:4-7). But all of these expressions are simply extensions of the one fundamental idea: If I am united to Christ, then all that is his is mine. So long as my heart, will and mind are one with Christ's in his word, I can approach God with the humble confidence that my prayers will be heard and answered.

~ Sinclair B. Ferguson

Commandments are the railroad tracks on which the life empowered by the love of God poured into the heart by the Holy Spirit runs. Love empowers the engine, law guides the direction. They are mutually interdependent. The notion that love can operate apart from law is a figment of the imagination. It is not only bad theology, it is poor psychology. It has to borrow from law to give eyes to love.

~ Sinclair B. Ferguson

True faith takes its character and quality from its object. Its strength therefore depends on the character of Christ. Even those of us who have weak faith have the same strong Christ as others!

~ Sinclair B. Ferguson