Is there any computer program that can display on console or any other medium the instructions that composed it? Does any computer language have capabilities for this? Is it possible?
A short python example:
Assuming that the source code is in the file /path/to/file.py
#!/usr/bin/env python3
with open('/path/to/file.py') as file:
print(file.read())
This is a very contrived example, but it illustrates the point.
EDIT
By the definition of a quine this is technically cheating as it takes input by reading its own source file