the use and the meaning of the verb 実感する in the given example

Question

I would like to ask for help with translating the following sentence:

今日は、「練習していないことは嘘をつかない」という悲しいセリフを実感しました。練習も嘘をつかないんだけど、その逆も然り。

I understand parts of it for example

練習していないことは嘘をつかない
悲しい
セリフ
実感する

But my problem is putting them together in translation of the sentence above. Also, I found out that 実感する　means "have a feeling", "my actual feeling" is or "to realize", but I can't make it out which one is the right one here.

So basically, I have problem with the use of the verb 実感する, furthermore with the translation of the whole sentence.

Answer 1

Something like

今日は、「練習していないことは嘘をつかない」という悲しいセリフを実感しました。
Today I experienced the sad line "the fact of not having practised doesn't lie" for myself.

If you gave some context there might be a more fitting translation.

Answer 2

It's something along the lines of:

Today I realized what is really meant by the woeful words, "it shows when you have not practiced". I know it shows when one has practiced; but, the opposite is also very true.

Basically, 実感 means that one has "actually (実) experienced/felt (感)" something.