“…the Father himself loves you, because you have loved me and have believed that I came from God” (John 16:27).
Agreeing with a fact does not change a life, but it does have potential.
You might be aware of someone in need, but if you do not act upon that knowledge your awareness is useless:
“Even so faith if it hath not works is dead, being alone” (Jas. 2:17).
Before his crucifixion, Jesus assured His disciples that the Father loved them. He assured them by the two phrases found here:
Because you have loved me, and
Have believed that I came from God (John 16:27b).
These two statements make up the physics of faith.
The disciples came to believe that Jesus came from God. That produced potential.
As a result of the facts they believed, they loved Him. Not, they felt good about Him, true as that may be. Rather, their faith was active; it had been characterized by service and devotion. Some believed the facts, but refused to act upon them (cf. John 12:42).
Faith must mobilize or it is dead, useless – like a body without a spirit, like a stone without a builder. All the beautiful, hand-hewn stones for Solomon’s Temple were of no use sitting in the quarry.
The definition of saving faith always implies both potential energy (belief) and kinetic energy (action).
Further, knowledge and action constitute a cause, the effect of which is God's favor, "The Father loves you..."
No knowledge, no potential. No potential, no action. No action, no cause. No cause, no effect.
That is the physics of faith.