People should work and not be justified

thank you 

Sorry, I couldn´t understand what you meant? "and not be justified"

People should work not just saying I am going to do this but... or I may do this but... 

Forumumuza hoş geldiniz

Bir insan birşey yapacağını dediğinde onu yapmalı, bir bahane bulup yapamadım demekle olmaz.

My try 

Thank you sooooo much I hope you say it more easier because I am a begginer and my teacher is going to think someone helped me

If you want more shorter, you can just say

İnsanlar verdikleri sözü tutmalı

or 

İnsanlar sözlerini tutmalı

Ok thats great thanks a lot