Speechless

A sonnet written to convey what can't be put into words. Please critique

Words can cross any distant mountain range;
They can travel over every sea.
Yet no matter how hard I try to change,
I still can't find them when you're around me.

I've spent years practicing this one hobby,
What some free-minded spirits may call art,
Yet nothing from the physical body
Could ever match the passion of the heart.

Which is all I can offer to you now
For everything that I cannot say.
You may not understand all of this vow,
But still remember this every day:

Where my speech and every word has failed,
Let all of my actions and thoughts prevail.