Friends:

The Three Undeniable Global Properties:

Q: Is the body and all external form, lasting or transient? A: Transient
Q: Is feeling, pleasant or not, lasting or transient? A: Transient!
Q: Is experienced perceptions lasting or transient? A: Transient!
Q: Is the mental constructions lasting or transient?
A: Transient!
Q: Is naked awareness = consciousness lasting or transient?
A: Transient!
Q: Is the eye, ear, nose, tongue, body and mind, lasting or transient?
Q: Is form, sound, smell, taste, touch and thought, lasting or transient?
Q: Is solidity, fluidity, heat, motion, and space, lasting or transient?
Answer: All these are Transient!, Impermanent!, Temporary!, Fleeting!

Q: Is what is transient, happiness or suffering? A: Decay is Suffering!
Q: Is what is transient, ever changing and therefore frustrating pain
suitable to be regarded as: "This is Mine, This I Am, This is Me"
"This I can Keep,
This I can control, This I Posses, This is my Self" ... ???
Answer: No certainly Not ...!!!, since what is self must be keepable, same,
constant, controllable, under one's own full power, and thus pleasant...
As all these phenomena are none of this, they cannot ever be self!

Seeing this, understanding this, comprehending this, the Noble Learner is
disgusted by all form,
disgusted by all sensing, by all physical, by all mental.
Being thus disgusted, one experiences an opening disillusion... The veil is off.
Without illusions, the mind is fully released and one immediately knows:
This mental liberation is final and irreversible. This - exactly this state -
is called Nibbāna, experienced is this very life ...

Regarding these 3 general characteristics or signs (Ti-lakkhana) see also:
http://what-buddha-said.net/library/DPPN/wtb/s_t/ti_lakkhana.htm
http://what-buddha-said.net/drops/V/Anything_Whatsoever.htm
http://What-Buddha-Said.net/drops/The_3_Ultimate_Facts.htm

Life always involves Suffering and is inevitably Sorrowful!