Here are the best ones:
It is not the mountain we conquer but ourself
Everyone thinks of changing the world, but no one thinks of changing himself
Be who you are and say what you feel because those who mind don´t matter and those who matter don´t mind
Don´t mind criticism. If it is untrue, disregard it; if unfair, keep from irritation; if it is ignorant, smile; if it is justified it is not criticism, learn from it
My grandfather once told me that there were two kinds of people: those who do the work and those who take the credit. He told me to try to be in the first group; there was much less competition.
Destiny isn´t a matter of chance: it´s a matter of choice
To digest and reflect upon during Easter holidays...
Lastly, a YouTube clip about effective communication: