sensitive and feeling

more sensitive more feeling,
less sensitive less feeling,

more sensitive more easy feel offended,
less sensitive less easy feel offended,

can decrease sensitive for person who have more sensitive?
can increase sensitive for person who have less sensitive?

how to decrease sensitive for person who have more sensitive?
how to increase sensitive for person who have less sensitive?

sensitive is permanent or temporary?
feeling is permanent or temporary?

if sensitive is permanent then can not change sensitive,
if sensitive is temporary then can change sensitive,

if feeling is permanent then can not change feeling,
if feeling is temporary then can change feeling,

why human must have sensitive?
why human must have feeling?

why GOD created sensitive?
why GOD created feeling?

what GOD purpose?
what GOD want?