How to use CLOB datatype for storing limitless characters in column each rows?

I want to use CLOB datatype instead of varchar2(4000) and long, in which I want store limitless characters . However, its easy to declare the string based column to CLOB but the main problem is when I insert the paragraph it stores and on runtime when check it shows just a single line.. As am new, your guidance will help me a-lot thanks. I have tried this, on runtime it only displays limited characters. I want to store one page paragraph in single row and on runtime it displays all the characters of the paragraph. Note: Using SQL*PLUS