'Perceived' in the Bible

And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.

The wise man's eyes are in his head; but the fool walketh in darkness: and I myself perceived also that one event happeneth to them all.

There is nothing better for people than to eat and drink, and to find enjoyment in their work. I also perceived that this ability to find enjoyment comes from God.

So I perceived there is nothing better than for people to enjoy their work, because that is their reward; for who can show them what the future holds?