T - Total Depravity
Total depravity refers to the affect of sin and how it reaches our entire body. Sin affects every part of our being-body, soul, mind, will, etc… We are all born in sin, not one part of us is sinless.
U - Unconditional Election
This doctrine means that our election is sovereignly chosen by God. In other words, he did not choose us because we were smart or beautiful or because of all the good, witty, and wonderful works we did but because of His good pleasure. "We chose Him because He first chose us."
L - Limited Atonement
Limited Atonement means that Christ died only for His elect. Christ's atonement was limited in the sense that Christ suffered and died for his people - His elect.
I - Irresistible Grace
Irresistible grace is referring to the inward call of God.The inward call is powerful and effective. It is irresistible in a sense that it achieves it purpose.
P - Perseverance of the Saints
Perseverance of the Saints means that it is possible to be sure of your salvation and that once you are saved you cannot backslide. When destined for the kingdom you will never go to hell. A saying is, "If you've lost it, you never had it. If you have it, you'll never lose it."