I'll point out some of the exact similarities:
"I am Alpha and Omega, the beginning and the end, the first and the last." - Jesus (Revelation 22:13)
"I am also the beginning, the middle, and the end of all beings." Krishna (BG 10.20)
"If you realize that all things change, there is nothing you will try to hold on to" - Lao Tzu
"Everything changes, nothing remains without change" - Buddha
“He who rules his spirit has won a greater victory than the taking of a city.” - Jesus
"It is better to conquer yourself than to win a thousand battles. Then the victory is yours. It cannot be taken from you, not by angels or by demons, heaven or hell" - Buddha
And he said, "Whoever discovers the interpretation of these sayings will not taste death. " - Jesus (Gospel of Thomas, 1)
"I shall now explain the knowable, knowing which you will taste the eternal..." - Krishna (BG 13.13)
"Rather, the (Father's) kingdom is within you and it is outside you." - Jesus (Gospel of Thomas, 3)
"The Supreme Truth exists outside and inside of all living beings...." - Krishna (BG 13.16)
"Three things cannot be long hidden: the sun, the moon, and the truth" -Buddha
"For there is nothing hidden that will not be revealed." - Jesus (Gospel of Thomas, 5)
"It is better to do one's own duty, however defective it may be, than to follow the duty of another, however well one may perform it. He who does his duty as his own nature reveals it, never sins." - Lao Tzu
"It is far better to discharge one's prescribed duties, even though faultily, than another's duties perfectly. Destruction in the course of performing one's own duty is better than engaging in another's duties, for to follow another's path is dangerous." - Krishna (BG 3.35)
"It is, Kassapa, as if a potter made different vessels out of the same clay. Some of these pots are to contain sugar, others rice, others curds and milk others still are vessels of impurity. There is no diversity in the clay used the diversity of the pots is only due to the moulding hands of the potter who shapes them for the various uses that circumstances may require." - The Buddha (Gospel of Buddha, 55.2)
"Gold alone is present before its manufacture into gold products, the gold alone remains after the products' destruction, and the gold alone is the essential reality while it is being utilized under various designations. Similarly, I alone exist before the creation of this universe, after its destruction and during its maintenance." Krishna (SB 11.28.19)
"Health is the greatest possession. Contentment is the greatest treasure. Confidence is the greatest friend. Non-being is the greatest joy." - Lao Tzu
"Health is the greatest gift, contentment the greatest wealth, faithfulness the best relationship." - The Buddha
I could continue describing other innumerable exact similarities. As you can see, some of these match word for word, almost as if they are indeed trying to explain the same essential truth to mankind.....isn't it also ironic that they all promise eternal bliss..freedom from all suffering...etc...just think about it