Too soon is to waste the good aspects of life, and perhaps unkind to those who love and need you. Too late means you might lose control.

Mishaps
How late soe'er they come, come aye too soon.

Toffler’s Law, I guess: the future arrives too soon and in the wrong order.

Those thoughts that come to us suddenly and that are not yet ours.

Say too soon what you think and you will say what everyone else thinks.

When you are falling in love it is always already too late: dēute, as the poets say.

We think too much and feel too little.

Being right too soon is socially unacceptable.

I regret it when I suppress my feelings too long and they burst forth in ways that are distorted or attacking or hurtful.

If you wait till you know everything it's too late

We are now faced with the fact that tomorrow is today. We are confronted with the fierce urgency of now. In this unfolding conundrum of life and history there is such a thing as being too late. Procrastination is still the thief of time. Life often leaves us standing bare, naked, and dejected with a lost opportunity. The tide in the affairs of men does not remain at flood — it ebbs. We may cry out desperately for time to pause in her passage, but time is adamant to every plea and rushes on. Over the bleached bones and jumbled residues of numerous civilizations are written the pathetic words, "Too late."

You cannot do a kindness too soon, for you never know how soon it will be too late.

If you are too busy to think then you are too busy.

We all fear that our feelings are too big, especially in the moment we’re actually having them. We were taught not be too loving, we’d get hurt; too smart, we’d get bullied; too fearful, we’d be vulnerable. To be compliant with what other people wanted us to feel. As kids we were punished for crying out if our emotional experience wasn’t in accordance with our parents' convenience. (No wonder we still respond the way we do.)